In reply to AlisonSmiles:
> Rinsing a couple of times but also apparently important is the step of either tumble drying it or ironing it.
Rinsing will remove some detergent traces, but a soap wash is better.
Ironing or tumble drying will work for a while on a new-ish jacket, since the heat helps to re-distribute the DWR treatment.
Care must be taken not to iron or tumble too hot; the face fabric can melt, or the seam seal tape glue can melt in the dryer... Regular checks and low heat setting are advised...
Gore and Event seem to change their washing instructions a lot; it a bit of 'mutually assured destruction', where each seems to be trying to say their fabric is easier to clean. Gore used to say 'use any detergent', apparently not caring that their DWR would be compromised. My only conclusion was that the majority of Gore users didn't care about breathability or wetting out. Their website instructions now say nothing other than, effectively, 'read the f*cking label'... Great.
Event originally said to use only soap. Then they found problems with body oil causing reverse osmosis leakage in their open pore structure (exactly as Gore did with Gen 1 Gore-tex). So they revised their instructions to suggest a detergent wash to remove the body oil traces, followed by a soap wash to remove the detergent traces... I think they've now caught up with Gore from a few years back, so say 'use any detergent'...
Personally, I try to avoid using detergent on any DWR-treated item, unless I really have to. I try a clean water wash, then a soap wash, and then detergent followed by soap if it really seems needed.