Since rubber has pores, mold can infiltrate this substance and quickly turn your bath mat into a breeding ground for fungi. Luckily, you can safely clean it in a dishwasher.
It can be safely washed on a dishwasher's top rack once a month, although the bottom rack offers optimal cleaning for stubborn grime, and you won't even need any special soap.
Though a dishwasher will sterilize a mat, you can use a hook or an expandable bath caddy to hang it dry and drain the water after each use to keep it neat between cleanings.