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As stated, your first port of call should be the manufacturer's washing instructions

I'm not familiar with this fabric. A quick google of IsoTex basically shows it's Regatta waterproof fabric. Not much details on how it's made, etc. but it does state it has a DWR:

The DwR outer fabric reinforces the waterproof quality and helps the water to run off whilst adding to the garment's windproof performance.

If it's got a Hydrostatic Head of 5000 then it's not as waterproof as Gore-Tex. This, and looking at the types of coat its made into, and the price point for, etc. makes me think it's not got got a physical barrier like Gore-Tex (or if it does, it's not as sophisticated).

Bearing all the above in mind, you want a non-detergent cleaner. I always use NikWax Tech Wash. Regatta recommend their own brand, but well they would... I've always had good results with the NikWax one though. Don't use normal washing powder; that will reduce the effectiveness of the DWR.

I would definitely then apply a new DWR. From looking at similar fabrics and reading reviews, a good application of DWR is pretty essential to this coat; without it, it isn't going to stay waterproof for long.

I prefer a spray-on one as opposed to a wash-in one. It allows you to be more targeted in its application, i.e. only spray it on the outside where it's supposed to go.

Tumble drying will improve the DWR. DWR works by tiny microscopic spikes keeping the water from soaking in. Over time these spikes wear down. Tumble drying (heating) allows the chemicals to re-form these spikes. Will it ruin your coat? What does the label say? If it says do not tumble dry, then don't. If it says you can, it will help and is worth doing.

As stated, your first port of call should be the manufacturer's washing instructions

I'm not familiar with this fabric. A quick google of IsoTex basically shows it's Regatta waterproof fabric. Not much details on how it's made, etc. but it does state it has a Durable Water Repellent (DWR):

The DwR outer fabric reinforces the waterproof quality and helps the water to run off whilst adding to the garment's windproof performance.

If it's got a Hydrostatic Head of 5000 then it's not as waterproof as Gore-Tex. This, and looking at the types of coat its made into, and the price point for, etc. makes me think it's not got got a physical barrier like Gore-Tex (or if it does, it's not as sophisticated).

Bearing all the above in mind, you want a non-detergent cleaner. I always use NikWax Tech Wash. Regatta recommend their own brand, but well they would... I've always had good results with the NikWax one though. Don't use normal washing powder; that will reduce the effectiveness of the DWR.

I would definitely then apply a new DWR. From looking at similar fabrics and reading reviews, a good application of DWR is pretty essential to this coat; without it, it isn't going to stay waterproof for long.

I prefer a spray-on one as opposed to a wash-in one. It allows you to be more targeted in its application, i.e. only spray it on the outside where it's supposed to go.

Tumble drying will improve the DWR. DWR works by tiny microscopic spikes keeping the water from soaking in. Over time these spikes wear down. Tumble drying (heating) allows the chemicals to re-form these spikes. Will it ruin your coat? What does the label say? If it says do not tumble dry, then don't. If it says you can, it will help and is worth doing.

As stated, your first port of call should be the manufacturer's washing instructions

I'm not familiar with this fabric. A quick google of IsoTex basically shows it's Regatta waterproof fabric. Not much details on how it's made, etc. but it does state it has a DWR:

The DwR outer fabric reinforces the waterproof quality and helps the water to run off whilst adding to the garment's windproof performance.

If it's got a Hydrostatic Head of 5000 then it's not as waterproof as Gore-Tex. This, and looking at the types of coat its made into, and the price point for, etc. makes me think it's not got got a physical barrier like Gore-Tex (or if it does, it's not as sophisticated).

Bearing all the above in mind, you want a non-soap cleaner. I always use NikWax Tech Wash. Regatta recommend their own brand, but well they would... I've always had good results with the NikWax one though. Don't use normal washing powder; that will reduce the effectiveness of the DWR.

I would definitely then apply a new DWR. From looking at similar fabrics and reading reviews, a good application of DWR is pretty essential to this coat; without it, it isn't going to stay waterproof for long.

I prefer a spray-on one as opposed to a wash-in one. It allows you to be more targeted in its application, i.e. only spray it on the outside where it's supposed to go.

Tumble drying will improve the DWR. DWR works by tiny microscopic spikes keeping the water from soaking in. Over time these spikes wear down. Tumble drying (heating) allows the chemicals to re-form these spikes. Will it ruin your coat? What does the label say? If it says do not tumble dry, then don't. If it says you can, it will help and is worth doing.

As stated, your first port of call should be the manufacturer's washing instructions

I'm not familiar with this fabric. A quick google of IsoTex basically shows it's Regatta waterproof fabric. Not much details on how it's made, etc. but it does state it has a DWR:

The DwR outer fabric reinforces the waterproof quality and helps the water to run off whilst adding to the garment's windproof performance.

If it's got a Hydrostatic Head of 5000 then it's not as waterproof as Gore-Tex. This, and looking at the types of coat its made into, and the price point for, etc. makes me think it's not got got a physical barrier like Gore-Tex (or if it does, it's not as sophisticated).

Bearing all the above in mind, you want a non-detergent cleaner. I always use NikWax Tech Wash. Regatta recommend their own brand, but well they would... I've always had good results with the NikWax one though. Don't use normal washing powder; that will reduce the effectiveness of the DWR.

I would definitely then apply a new DWR. From looking at similar fabrics and reading reviews, a good application of DWR is pretty essential to this coat; without it, it isn't going to stay waterproof for long.

I prefer a spray-on one as opposed to a wash-in one. It allows you to be more targeted in its application, i.e. only spray it on the outside where it's supposed to go.

Tumble drying will improve the DWR. DWR works by tiny microscopic spikes keeping the water from soaking in. Over time these spikes wear down. Tumble drying (heating) allows the chemicals to re-form these spikes. Will it ruin your coat? What does the label say? If it says do not tumble dry, then don't. If it says you can, it will help and is worth doing.

As stated, your first port of call should be the manufacturer's washing instructions

I'm not familiar with this fabric. A quick google of IsoTex basically shows it's Regatta waterproof fabric. Not much details on how it's made, etc. but it does state it has a DWR:

The DwR outer fabric reinforces the waterproof quality and helps the water to run off whilst adding to the garment's windproof performance.

If it's got a Hydrostatic Head of 5000 then it's not as waterproof as Gore-Tex. Looking at the coats its made from, and the price point for this, makes me think it's not got got a physical barrier like Gore-Tex (or if it does, it's not as sophisticated).

Bearing all the above in mind, you want a non-soap cleaner. I always use NikWax Tech Wash. Regatta recommend their own brand, but well they would... I've always had good results with the NikWax one though. Don't use normal washing powder; that will reduce the effectiveness of the DWR.

I would definitely then apply a new DWR. From looking at similar fabrics and reading reviews, a good application of DWR is pretty essential to this coat; without it, it isn't going to stay waterproof for long.

I prefer a spray-on one as opposed to a wash-in one. It allows you to be more targeted in its application, i.e. only spray it on the outside where it's supposed to go.

Tumble drying will improve the DWR. DWR works by tiny microscopic spikes keeping the water from soaking in. Over time these spikes wear down. Tumble drying (heating) allows the chemicals to re-form these spikes. Will it ruin your coat? What does the label say? If it says do not tumble dry, then don't. If it says you can, it will help and is worth doing.

As stated, your first port of call should be the manufacturer's washing instructions

I'm not familiar with this fabric. A quick google of IsoTex basically shows it's Regatta waterproof fabric. Not much details on how it's made, etc. but it does state it has a DWR:

The DwR outer fabric reinforces the waterproof quality and helps the water to run off whilst adding to the garment's windproof performance.

If it's got a Hydrostatic Head of 5000 then it's not as waterproof as Gore-Tex. This, and looking at the types of coat its made into, and the price point for, etc. makes me think it's not got got a physical barrier like Gore-Tex (or if it does, it's not as sophisticated).

Bearing all the above in mind, you want a non-soap cleaner. I always use NikWax Tech Wash. Regatta recommend their own brand, but well they would... I've always had good results with the NikWax one though. Don't use normal washing powder; that will reduce the effectiveness of the DWR.

I would definitely then apply a new DWR. From looking at similar fabrics and reading reviews, a good application of DWR is pretty essential to this coat; without it, it isn't going to stay waterproof for long.

I prefer a spray-on one as opposed to a wash-in one. It allows you to be more targeted in its application, i.e. only spray it on the outside where it's supposed to go.

Tumble drying will improve the DWR. DWR works by tiny microscopic spikes keeping the water from soaking in. Over time these spikes wear down. Tumble drying (heating) allows the chemicals to re-form these spikes. Will it ruin your coat? What does the label say? If it says do not tumble dry, then don't. If it says you can, it will help and is worth doing.