Many people have come to us complaining of hard water stains on their small bath vanities or hard water deposits on their customized bathroom vanities with granite tops. We hate to sound like the extended commercial you may have seen on TV, but CLR is the best product to remove calcium deposits and hard water stains. Additionally, if you are looking to go the green route, we also found a strong solution of vinegar and water to work, but not as well. The trick is to let it soak for an extended period of time before you attempt to scrub off the deposit or hard water stain.