following up, would not recommend wetting this down, under the top fabric is a layer of foam, stapled & glued to a sheet of 3/8" fiberboard, (it was that that was causing the stain after washing) glued to the cutting map with HEAVY glue that is impossible to get off, tried alcohol, WD40, heat, solvent, scraping, waaay too much work. not to have anything work. Now have the top washed, still have the original stain, haha, the foam is ok, the fiberboard is warped, the cutting mat has a heavy layer of glue. It's all headed to the landfill & I'm looking for a 60% off coupon to Joann's. Thanks everyone for trying.