WIOs are made with 100% wool and *will* need washed gently and lanolized every so often as well. The soakers are typically snap-ins. I throw the snap-in part in the pail and set the wool aside to dry if needed. If the wool seems dry I'll stick another snap-in or other folded soaker and put it back on Moose. If it gets poop on it I just rinse if off in warm-coolish water and set it aside to dry. Otherwise their care is exactly like our soakers.