FYI my mats are too big to soak (or my tub is too small) but I use white vinegar for everything. So I spray mine periodically after using a mat smoothing stone (got at my LQS) and wipe down then air dry. Works for me. I also use white vinegar as a disenfectant in my laundry, to clean my kitchen counters and sink, etc etc. cheaper than Odoban but still nontoxic. Oh also soaked my dog's paw when he caught his dew claw and hurt it. Kept it clean and of course he's going to lick at it, but wouldn't hurt him. Grandma was right, vinegar has a million uses!