Glad you have brought this topic up as I was going to mention it myself.
2 weeks ago I had a go at re-proofing an old coat of mine for cycling use. It's a
Regatta breathable type made from Isotex. I did some reading on the tinterweb and saw the soap flakes suggested or the nikwax pre-proofing wash stuff (£££) and decided to use some of my wifes Persil Silk & Wool washing liquid as it sounds as though it is basicaly a liquid form of the soap flakes.
I machine washed the coat without conditioner and then did a few repeated rinses to remove any traces of soap, so far so good. I then used the Nikwax TX direct wash in proofer and hand washed in the sink as per the instructions as I thought the machine wash method of applying would surely rinse all the stuff out?
I duly hung the coat up to dry over the bath and later when washing up noticed how wonderfully the water on and around my stainless steel kitchen sink was beading (like on a freshly waxed car bonnet) so was expecting great things from my rejuvinated coat.
Once dried I splashed a little water on the coat and was dismayed to see it soak straight in without a suggestion of beading on the surface! I decided to do a second treatment but this time I wouldn't rinse the treatment out but would simply treat then squeeze dry and hang up. This second attempt still did not improve things.
WHAT AM I DOING WRONG?
The stuff obviously works as seen on my sink so why isn't it taking to my breathable (technical material?) jacket?
edited for spelling