Hot water and Dawn, agitate with hands (only if you have high threshold for pain, tap water can get pretty hot), drain water, more hot water and dawn, let soak 30 min, rinse until water runs clear (hot water is better but not needed). This is what I do and it works great. I usually throw out my Megs foam pads once they start to break apart everywhere. Wally World has them on sale about that often so I can stock up.