Maybe you can breed another tribe of mold and then have them declare war on each other. That should do the trick!
Throw it out and buy a new one at the dollar store
Yeah bath tub mats are too expensive. It's worth the health risk and the work it will take to attempt to get rid of it. Good luck.
Wash it with a little bleach and a lot of hot water, in your washing machine ideally.
have you soked it in bleach?
Kaboom, Its amazing for cleaning mold off of tile and bath mats etc... No, I have not been possessed with Willie May's spirit. it just that it is that good of a product
Pee on it!
You can try to clean it, but how do you know if it's really gone? Is it a rubber mat that goes in the tub or a rug that you stand on when you get out? The latter you would have to throw out because it gets into the weave.
I'd get rid of it, myself.
Sprinkle Comet Cleanser and let it sit there for a while and then get some diluted bleach water and scrub it with a brush. Keep Repeating