This solution is for heavy duty cleaning. Washing soda can be found in the cleaning aisle of your local grocery store along with the detergents and other cleaning products. Washing soda is not baking soda. I use Arm And Hammer Super Washing Soda.
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How to clean black mold from shower silicone sealant - nCleaningTips.com
To clean black mold from shower silicone sealant, mix white vinegar and 2 teaspoons of baking soda in a spray bottle. Spray the silicone mold and let sit for about an hour. Clean w toothbrush, rinse w hot water, wipe dry.