Sulfur is a yellow, nonmetallic element found in a variety of forms and locations. High amounts of sulfur in water leave yellow and brown stains in bathtubs, toilets, sinks, and showers. These stains may seem relentless, but don't give up.
Put on rubber gloves and protective eyeglasses. Pour the Borax into a bowl.
Moisten a sponge with vinegar. Firmly press the damp sponge into the bowl with Borax. The Borax will stick to the sponge.
Scrub the sulfur stains with the scrubbing side of the sponge. Repeat the first two steps if your sponge dries or runs out of Borax.
Scrub until the sulfur stains are no longer visible. Rinse well with hot water.