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Sprinkle powdered cleaner with bleach onto the surface of the sink mat. Straight bleach is too harsh for the rubber, as it causes it to eventually dry and crack.
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Scrub both sides of the sink mat with a dampened cleaning cloth to remove dirt, mold and mildew. Add more cleaner if necessary to remove all the grime. Rinse off your cleaning cloth in the sink from time to time, so you're not spreading the dirt around.
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Rinse both sides of the sink mat, in the sink, with cool water. Check to see if any dirt or mildew remains. If it does, you can repeat the process of cleaning it with additional cleaner until the sink mat is free of dirt and mildew.
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Wipe the sink mat with a dry towel and then let air-dry.
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Prevent your sink mat from drying and cracking by rubbing a little baby oil into the rubber. Let the mat sit for an hour, then wash it off with dish soap and water so any baby oil not absorbed into the rubber doesn't get on your dishes.
