You can remove it by scrubbing toothpaste in it or a vinegar.

Stains are something every individual on earth is tired of.  However, many people are concerned if they can use pure bleach on limestone to remove mould stains; the answer to which is yes. Pure bleach can be used to remove stains from the limestone. As lime stones are porous in nature, they have a tendency … Read more

Limestone is a stone surface that absorbs certain liquids. Rust stains can occur if these liquids run over certain metals before they reach the step. Rust stains are the most difficult of all to remove and cleaners that are purchased over the counter from hardware stores will not really have much effect on the stains. … Read more