I have had excellent results with the following process of cleaning my PFW pads:
After using them, I allow the wax, polish to fully dry, usually about a day or two. Then, unlike a regular wool pad- using a metal spur, I use my foam pad brush cleaner to get all the dry wax/polish off. Once I am satsfied that most of it is off (no more dust flying around), I wash in warm water with hair shampoo. I actually use shampoo to clean all my pads (both wool and foam). I found that the soap washes out more easily and doesnt clog the pores on foam or tangle the twines of the wool. I also found that the shampoo keeps the pads and wool soft and doesn't allow them to get that "crusty" feel until broken back in. Give it a try, it cleans well, and leaves them soft as the day they came out of the packages. I keep a bottle of it at my deep well sink in the garage just for this purpose...and like said before, I'd be broke if I used the pads once. Using this process, I get about 5 or 6 uses out of them, and find no reversal in cutting ability.