hopefully this is not a duplicate as I've searched for an answer on here before posting. I found this but there seems to be conflicting views on certain aspects of the question.
What I would like to know is how should I go about washing my waterproof coat? It's not GoreTex, but IsoTex (5000 on the waterproof scale). This will be the first time I have washed it, and I've had it about a year now. From reading other answers I assume I will need some sort of waterproofing agent to wash it with - are there different types for different materials and could anyone recommend a brand in the UK?
I'm also unsure about whether to tumble dry the coat or let it hang. I've seen comments claiming the tumble dryer will ruin the coat, and others saying it helps to reinforce the chemical outer layer. Can anyone confirm what the best method of drying the coat would be?
Lastly, I've seen plenty of waterproofing sprays in hiking shops before - are these any good/appropriate for use on a coat? Or are they just for re-applying lost waterproofing?