Natural Rubber Mats

Natural cleaning … How I can clean a moldy bathmat?
My rubber swimwear pink stuff in the folds, which I assume is mold. I like to use natural cleaning products. How I can get this thing clean again? Thanks!
Vinegar, soak mat during at least 30 minutes on the wrong side of the bath mat down-Use a good brush with maybe baking soda and peroxide bubbling action Oxy. Use gloves save your skin from drying out. Carpet Wash under running water.
Commercial Freight Trucks vs Rubber Mats