I have a pair of hedgehog 3 tall gtx I use for walking the dog and I usually just throw them in the washer on a low heat without any soap then just hang them on the line for a while, i do squirt a bit of that nikwax proofing on them too.
It seems to keep them fairly clean and water tight.
Only reason I dont put detergent in the wash is i thought your not supposed to with goretex type materials but i think you can use soap?
A new pair of innersoles once in a while helps with smell and comfort too.
Edited: 05/07/2012 at 13:27