half a lemon directly on the dark stain, let it sit for a few minutes, then wipe with a cloth. Repeat if the stain persists.
Borax . This is one of the most powerful ingredients for removing stains from almost any bathroom surface. Apply borax directly to the stain, then pour vinegar over it. After 20 minutes, scrub with a sponge, then rinse with water and dry thoroughly. Wear gloves and a mask while applying borax.
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