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Added:

Below BAQ = Benzalkonium Chloride / Quaternary Ammonium salts / ... etc.

Summary:

Effect on bacterial level

• Soap and water reduce level to about 0.08 of original
  (Will obviously vary with circumstances)

• Use of any sanitiser gives 0.01 on 1st use.

• Mutiple uses of sanitiser in succession give 0.01, 0.0001 2 uses, 0.000001 3 uses (if you can believe the graph cited below)

Excellent report here:

The Effect of Handwashing with Water or Soap on Bacterial Contamination of Hands

They conclude that washing with soap is more effective than water alone BUT under their conditions reduction in bacterial count was to 23% and 8% initially. So, a reduction by a factor of 12 is useful BUT 1/12th of "too many bugs" is still "too many bugs" in many cases.

I'll try and post some stats later but, based on a manufacturers promo card graph that I have, use of sanitiser gives 99% kill on first use and if you repeat it N times you get most of the survivors killed each time, so results become superb rapidly.

• Alcohols and BAQ manage about 99% at 1st use.

• 2nd use effectiveness (percentage of survivors killed) is

• 95-99% per wash on subsequent washes for 62% or 70% Ethanol

• BAQ 99% 1st use, 99.9% 2nd use, 99.99% 3rd use, around 99.99% per use after that.

• So BAQ is about 1 in 10 to the power of 2, 5, 9, ...
  That's somewhat hard to believe! More research needed.

• ABSTRACT: Handwashing is thought to be effective for the prevention of transmission of diarrhoea pathogens. However it is not conclusive that handwashing with soap is more effective at reducing contamination with bacteria associated with diarrhoea than using water only. In this study 20 volunteers contaminated their hands deliberately by touching door handles and railings in public spaces. They were then allocated at random to (1) handwashing with water, (2) handwashing with non-antibacterial soap and (3) no handwashing. Each volunteer underwent this procedure 24 times, yielding 480 samples overall. Bacteria of potential faecal origin (mostly Enterococcus and Enterobacter spp.) were found after no handwashing in 44% of samples. Handwashing with water alone reduced the presence of bacteria to 23% (p < 0.001). Handwashing with plain soap and water reduced the presence of bacteria to 8% (comparison of both handwashing arms: p < 0.001). The effect did not appear to depend on the bacteria species. Handwashing with non-antibacterial soap and water is more effective for the removal of bacteria of potential faecal origin from hands than handwashing with water alone and should therefore be more useful for the prevention of transmission of diarrhoeal diseases.

The two products have some commonality of use but a different focus.
Both have their place.

Soap is good for many things.
Sanitiser is an excellent companion when squatty toilets or dead animals in your water supply must be dealt with - read on ....

Soap is used (as I know you know) for cleaning - it removes contaminants that are hard or essentially impossible to remove by rubbing or scraping or by use of water alone. It essentially must have water to work and it needs water to rinse it away after it has done its job. It's use as a sanitiser is important but a secondary result of its main role. ie by removing material from your hands (or clothes or elsewhere) it also removes contaminants that may cause disease. Soap by itself does not kill germs very well - instead it removes them. If the water source used with soap is biologically contaminated, the final rinsing off of the soap may leave your hands looking clean but actually quite 'germ' covered. If you washed your hands with soap in a small stream where there was a dead animal carcase slightly up stream, or where the water was faecally contaminated, there is a good chance that they would look misleadingly safe and clean. You could carry the water you used for washing, or for final rinsing, but the former would be undesirable from a weight aspect, and carrying rinsing water introduces unusual cleaning patterns (wash in stream, rinse from bottle) and also incurs a weight and volume penalty.

Hand sanitisers deal with germs by killing them "en situ". They do not primarily remove biological contaminants but instead render them inactive. Depending on the sanitiser used they may be a good solvent as well, so may be useful to remove a degree of soiling. However, the volumes available and/or used are usually small and sanitisers such as ethyl alcohol tend to evaporate too fast to be used as an effective gross surface cleaner when used in small volumes. Because they do not need to utilise a local water source they are immune to the effects of local contamination. But if eg you had blood on your hands, or faeces, or had vomited, the sheer physical overload of contamination could render the sanitiser ineffective unless you used very substantial quantities.

The following isparagraph is not about backpacking, but has useful parallels:
I have travelled quite a lot in Asia in recent years - cities and travelling rather than hiking. I try to ensure that I have a small bottle of sanitiser with me at all times - no exceptions if possible. And, I seldom use it. After you have used a few 'squatty' toilets in typical conditions, and then gone to eat a meal, with or without the availability of a water supply for washing, having sanitiser to hand (literally) becomes very attractive. Even when water is available for washing in such situations, the merits of using it can be uncertain.

There are two main types of sanitisers, alcohol based and chemical based disinfectants. (You can argue that alcohol is also a chemical disinfectant :-) ). Alcohol (usually 60% - 85% Ethyl Alcohol, plus a gelling agent plus a bittering agent) will kill 99.9% or so biological contaminants on your skin in seconds. It evaporates without washing or wiping so leaves hands "guaranteed" low-germ if not actually no-germ. It's effect on the environment (apart from the part of the environment that you wipe it on) is minimal. Even poured on the ground or in a stream its effects would be extremely localised.
A 1 cc squirt from a pump bottle will clean two hands up to high wrist level if not actually visibly dirty. So a small 100c bottle will be ample for most journeys.

An alternative which is gaining favour relatively recently is Benzalkonium Chloride. (Also answers to the names a "Quaternary ammonium salts", Lauryl Dimethyl Benzalkonium Chloride, and a few other similar names. This is the disinfectant of your childhood and of ever since. Look at the labels of disinfectants in supermarkets and you'll find it is used in about 90%of them. Also used as a carpet cleaner, swimming pool disinfecte and moss killer. And more. Used under a vast number of labels and for any applications.
A 0.1% solution (!) is said by those currently touting it to be as effective as alcohol (by federal certification) and as it leaves a thin residue on your hands it keeps on keeping on. Unlike alcohol. At low concentrations it is very person-safe and can be used in mouth washes and similar. At 10% - 50% range it's nasty if ingested (ask me how I know :-( )(I won't make that stupid and careless mistake again) but that is an unusually high percentage. Cheapest is in budget disinfectant bottles in supermarkets at about 2%. Water down as required. Very cheap if bought as above. Does not evaporate well (similar to water). Ecologically probably OK in streams etc once diluted.

So:
Soap is good for many things.
Sanitiser is an excellent companion when squatty toilets or dead animals in your water supply must be dealt with.

The two products have some commonality of use but a different focus. Both have their place.

• Soap is good for many things.
• Sanitiser is an excellent companion when squatty toilets or dead animals in your water supply must be dealt with - read on ...

Soap is used (as I know, you know) for cleaning - it removes contaminants that are hard or essentially impossible to remove by rubbing or scraping or by use of water alone. It essentially must have water to work and it needs water to rinse it away after it has done its job. It's use as a sanitiser is important but a secondary result of its main role. ie by removing material from your hands (or clothes or elsewhere) it also removes contaminants that may cause disease. Soap by itself does not kill germs very well - instead it removes them. If the water source used with soap is biologically contaminated, the final rinsing off of the soap may leave your hands looking clean but actually quite 'germ' covered. If you washed your hands with soap in a small stream where there was a dead animal carcass slightly up stream, or where the water was faecally contaminated, there is a good chance that they would look misleadingly safe and clean. You could carry the water you used for washing, or for final rinsing, but the former would be undesirable from a weight aspect, and carrying rinsing water introduces unusual cleaning patterns (wash in stream, rinse from bottle) and also incurs a weight and volume penalty.

Hand sanitisers deal with germs by killing them 'in situ'. They do not primarily remove biological contaminants but instead render them inactive. Depending on the sanitiser used they may be a good solvent as well, so may be useful to remove a degree of soiling. However, the volumes available and/or used are usually small and sanitisers such as ethyl alcohol tend to evaporate too fast to be used as an effective gross surface cleaner when used in small volumes. Because they do not need to utilise a local water source they are immune to the effects of local contamination. But if eg you had blood on your hands, or faeces, or had vomited, the sheer physical overload of contamination could render the sanitiser ineffective unless you used very substantial quantities.

A Parallel to backpacking

I have travelled quite a lot in Asia in recent years - cities and travelling rather than hiking. I try to ensure that I have a small bottle of sanitiser with me at all times - no exceptions if possible. And, I seldom use it. After you have used a few 'squatty' toilets in typical conditions, and then gone to eat a meal, with or without the availability of a water supply for washing, having sanitiser to hand (literally) becomes very attractive. Even when water is available for washing in such situations, the merits of using it can be uncertain.

Types of sanitisers

There are two main types of sanitisers, alcohol based and chemical based disinfectants. (You can argue that alcohol is also a chemical disinfectant :-) ).

Alcohol (usually 60% - 85% Ethyl Alcohol, plus a gelling agent plus a bittering agent) will kill 99.9% or so biological contaminants on your skin in seconds. It evaporates without washing or wiping so leaves hands "guaranteed" low-germ if not actually no-germ. It's effect on the environment (apart from the part of the environment that you wipe it on) is minimal. Even poured on the ground or in a stream its effects would be extremely localized. A 1cc squirt from a pump bottle will clean two hands up to high wrist level if not actually visibly dirty. So a small 100cc bottle will be ample for most journeys.

An alternative which is gaining favour relatively recently is Benzalkonium Chloride. (Also answers to the names a "Quaternary ammonium salts", Lauryl Dimethyl Benzalkonium Chloride, and a few other similar names). This is the disinfectant of your childhood and of ever since. Look at the labels of disinfectants in supermarkets and you'll find it is used in about 90% of them. Also used as a carpet cleaner, swimming pool disinfectant and moss killer. And more. Used under a vast number of labels and for any applications.

A 0.1% solution (!) is said by those currently touting it to be as effective as alcohol (by federal certification) and as it leaves a thin residue on your hands it keeps on keeping on. Unlike alcohol. At low concentrations it is very person-safe and can be used in mouth washes and similar. At 10% - 50% range it's nasty if ingested (ask me how I know :-( )(I won't make that stupid and careless mistake again) but that is an unusually high percentage. Cheapest is in budget disinfectant bottles in supermarkets at about 2%. Water down as required. Very cheap if bought as above. Does not evaporate well (similar to water). Ecologically probably OK in streams etc. once diluted.

Conclusion

Soap is good for many things. Sanitiser is an excellent companion when squatty toilets or dead animals in your water supply must be dealt with.

Soap is used (as I know you know) for cleaning - it removes contaminants that are hard or essentially impossible to remove by rubbing or scraping or by use of water alone. It essentially must have water to work and it needs water to rinse it away after it has done its job. It's use as a sanitiser is important but a secondary result of its main role. ie by removing material from your hands (or clothes or elsewhere) it also removes contaminants that may cause disease. Soap by itself does not kill germs very well - instead it removes them. If the water source used with soap is biologically contaminated, the final rinsing off of the soap may leave your hands looking clean but actually quite 'germ' covered. If you washed your hands with soap in a small stream where there was a dead animal carcase slightly up stream, or where the water was faecally contaminated, there is a good chance that they would look misleadingly safe and clean. You could carry the water you used for washing, or for final rinsing, but the former would be undesirable from a weight aspect, and carrying rinsing water introduces unusual cleaning patterns (wash in stream, rinse from bottle) and also incurs a weight and volume penalty.

I have travelled quite a lot in Asia in recent years - cities and travelling rather than hiking. I try to ensure that I have a small bottle of sanitiser with me at all times - no exceptions if possible. And, I seldom use it. After you have used a few 'squatty' toilets in typical conditions, and then gone to eat a meal, with or without the availability of a water supply for washing, having sanitiser to hand (literally) becomes very attractive.

More soon ...

Soap is good for many things.
Sanitiser is an excellent companion when squatty toilets or dead animals in your water supply must be dealt with - read on ....

Soap is used (as I know you know) for cleaning - it removes contaminants that are hard or essentially impossible to remove by rubbing or scraping or by use of water alone. It essentially must have water to work and it needs water to rinse it away after it has done its job. It's use as a sanitiser is important but a secondary result of its main role. ie by removing material from your hands (or clothes or elsewhere) it also removes contaminants that may cause disease. Soap by itself does not kill germs very well - instead it removes them. If the water source used with soap is biologically contaminated, the final rinsing off of the soap may leave your hands looking clean but actually quite 'germ' covered. If you washed your hands with soap in a small stream where there was a dead animal carcase slightly up stream, or where the water was faecally contaminated, there is a good chance that they would look misleadingly safe and clean. You could carry the water you used for washing, or for final rinsing, but the former would be undesirable from a weight aspect, and carrying rinsing water introduces unusual cleaning patterns (wash in stream, rinse from bottle) and also incurs a weight and volume penalty.

The following isparagraph is not about backpacking, but has useful parallels:
I have travelled quite a lot in Asia in recent years - cities and travelling rather than hiking. I try to ensure that I have a small bottle of sanitiser with me at all times - no exceptions if possible. And, I seldom use it. After you have used a few 'squatty' toilets in typical conditions, and then gone to eat a meal, with or without the availability of a water supply for washing, having sanitiser to hand (literally) becomes very attractive. Even when water is available for washing in such situations, the merits of using it can be uncertain.

There are two main types of sanitisers, alcohol based and chemical based disinfectants. (You can argue that alcohol is also a chemical disinfectant :-) ). Alcohol (usually 60% - 85% Ethyl Alcohol, plus a gelling agent plus a bittering agent) will kill 99.9% or so biological contaminants on your skin in seconds. It evaporates without washing or wiping so leaves hands "guaranteed" low-germ if not actually no-germ. It's effect on the environment (apart from the part of the environment that you wipe it on) is minimal. Even poured on the ground or in a stream its effects would be extremely localised.
A 1 cc squirt from a pump bottle will clean two hands up to high wrist level if not actually visibly dirty. So a small 100c bottle will be ample for most journeys.

An alternative which is gaining favour relatively recently is Benzalkonium Chloride. (Also answers to the names a "Quaternary ammonium salts", Lauryl Dimethyl Benzalkonium Chloride, and a few other similar names. This is the disinfectant of your childhood and of ever since. Look at the labels of disinfectants in supermarkets and you'll find it is used in about 90%of them. Also used as a carpet cleaner, swimming pool disinfecte and moss killer. And more. Used under a vast number of labels and for any applications.
A 0.1% solution (!) is said by those currently touting it to be as effective as alcohol (by federal certification) and as it leaves a thin residue on your hands it keeps on keeping on. Unlike alcohol. At low concentrations it is very person-safe and can be used in mouth washes and similar. At 10% - 50% range it's nasty if ingested (ask me how I know :-( )(I won't make that stupid and careless mistake again) but that is an unusually high percentage. Cheapest is in budget disinfectant bottles in supermarkets at about 2%. Water down as required. Very cheap if bought as above. Does not evaporate well (similar to water). Ecologically probably OK in streams etc once diluted.

So:
Soap is good for many things.
Sanitiser is an excellent companion when squatty toilets or dead animals in your water supply must be dealt with.