Our bathroom stain cleaner contains EDTA disodium, sodium bicarbonate, and laureth-7. It can effectively remove stubborn stains from bathtubs, tiles, shower heads, and glass, making them clean and shiny again in just a few minutes. Its usage method is very simple: 1. Spray an appropriate amount of this product in the desired area of the bathroom. 2. Use a sponge to wipe the stain back and forth until it is completely removed. Wipe off excess residue with a clean cloth. Effectively remove hard water stains, soap scum, and other grime, making your bathroom look brand new.