Finally i would give your mat a good soak in vinegar and water at least once every couple months with a good rinse afterward and hang to dry.
How to remove fungus bath mat.
We know that you have lots of questions about cleaning and we want to give you those answers.
Sprinkle it on and scrub it off.
Keep your bath mat clean by spraying it with a bathroom cleaner and wiping it down every week.
To freshen up the bath mat with a quick clean scrub the rubber bath mat with a cleaning brush or scouring pad to remove dirt and debris after soaking for a few minutes.
To eliminate mold or mildew leave the rubber bath mat in the diluted bleach solution for 3 4 hours.
Keeping the mat as dry as possible between uses is the key to mold and mildew.
Turn on a fan exhaust fan or open a window after you take a shower to reduce the level of mildew causing moisture in your bathroom.
You can wash it in the washing machine cold or warm water please and don t put it in the dryer or you can use borax to clean and disinfect.
When you get your new one after using the tub remove the rubber mat and roll it in a towel to dry it.
Prevent new mildew stains from forming by hanging up your bath mat in a cool dry area after each use.
Sorry to say there is no easy way to keep your mat mold free other that to keep it completely dry when not in use.
This will help stay on top of any mildew or soap scum build up in turn preventing moldy bath mats.
Place the mat in the washing machine and set the machine to a gentle cycle setting and the water temperature to a warm or hot setting to kill any existing mold mildew or bacteria on the bath mat.