I just got thru washing my 7 year old Olfa mat. I followed their instruction. Use warm water, 1/4 cup white vinegar and a squirt or 2 of mild dishwashing liquid. Used a soft brush (they suggested a mushroom brush) and then lay flat, out of the sun, to dry. It looks cleaner and brighter! The water is supposed to add moisture to it also. I hope it helps...it was getting knicked up and dry. I love Olfa.
sandy