It’s probably just grime from your arm and clothing, but there could be a little mold there as well.
First vacuum the surface thoroughly to remove any dirt and debris. Then, scrub lightly with a mixture of warm water and laundry detergent. Mix in some white vinegar or baking soda to help deal with mold. Rinse with cold water and let dry and if the result isn’t satisfactory try again.
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It’s probably just grime from your arm and clothing, but there could be a little mold there as well.
First vacuum the surface thoroughly to remove any dirt and debris. Then, scrub lightly with a mixture of warm water and laundry detergent. Mix in some white vinegar or baking soda to help deal with mold. Rinse with cold water and let dry and if the result isn’t satisfactory try again.