The purpose is not to soak to rejuevenate the mat, but to clean it after you have cut fleece, Minkee, batting, etc. so that you can get the fibers out of your mat. I have never soaked one of mine. I wet a sponge with warm water and a little Dawn and wash the mat, then use a Mr. Clean eraser and rub gently. Let the mat dry thoroughly laying flat before using it again.