The products recommended for cleaning breathable materials such as gore-tex, event, sympatex are
1) Grangers Fabric Wash
2) Nikwax Tec-Wash
Both these systems are actually a two step process. First you wash the garment, then apply a re-proofing material. The wash does not damage the mebrane or glue. The re-proof restores the DWR(durable water repellent) coating on the face fabric. The garment will not leak if you don't re-proof, but the fabric may absorb water(wet out) and this reduces brethability.
Tips that are not in the instructions on the bottle are......
Don't use the wash-in re-proofing, only use the spray on type. The wash in makes both sides of your jacket water repellent, and you don't want the inside to be because it reduces the breathability.
Also, run the machine once empty to get rid of any residual washing powder.
p.s. i'm not wierd, i used to work for Snow and Rock