I think this is just an over riding misconception for most people (outside of the outdoor industry) that these garments and their material are fragile or require very special attention when cleaning, when the truth is that they are actually very robust and have very simple requirements for washing that actually help pro long the life and performance of the jacket.
this section on the veilance website is a bit hidden but gives a good overview of what to do, and I think most of these topics with a quick google or look on the main brand site would locate a tutorial.
I think the other misconception I read over and over is that the DWR treatment (that makes the water bead) has any bearing on a goretex garment being waterproof. this treatment is in fact removed from the garments before it is tested for being waterproof to pass gore's regulations. its only function is to reduce the amount of water sitting on or absorbing in to the face fabric on the garment in pro longed rain, even if the face fabric takes on water the gore membrane stops the water passing through to the inner.