You may notice that the mixture will turn blackish as some clog might bubble up into the sink. That’s what you see in this photo. After allowing the vinegar and baking soda to work their magic ...
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Then soak the drain in vinegar to remove mildew surrounding the drain opening. For stubborn grime, use an old toothbrush with a bit of baking soda. Wipe away the residue with a damp cloth.