Wash with a Synthetic Fabric Cleaner first, then spray the garment with revivex and put in the drier (delicate setting) to dry. It works great.
Waders are another story, you have to hand wash with a Synthetic Fabric Cleaner first. After the waders are washed and thoroughly rinsed, saturate the outside of the waders with Revivex® or other water repellent treatment. Allow product to drip-dry. "Set" the treatment with heat using a blow dryer or iron (low setting), avoiding the stockingfoot attachment area.