Mineral stains, deposits and build-up--such as lime, copper, scale, rust and calcium--can form on the inside of your toilet bowl. These minerals are naturally found in tap water and with regular flushing, will build-up and stain your toilet. Calcium build-up will cause your toilet to look dingy and dirty. With regular cleaning, you can keep the mineral stains and deposits at bay. If, however, your toilet bowl is already stained with calcium you will need to implement a little hard work to restore the look of your toilet bowl.
Shut off the toilet's water supply. Typically, there is a shut off valve below the toilet. Flush the toilet to allow all water to drain from the bowl.
Wear a pair of rubber gloves.
Dampen a pumice stone under cool water. Pumice stones are available at your local department stores in their health and beauty section.
Scrub the inside of the toilet bowl with the pumice stone to remove the calcium build-up. Scrub gently in a back-and-forth motion. Scrub the inside of the toilet bowl completely until all calcium stains are gone.
Rinse the inside of the bowl by wiping with a cloth saturated in cool water. Rinse all pumice residue from the toilet bowl.
Turn the toilet's water supply back on. Allow the bowl and tank to fill with the water.
Flush the toilet a few times to remove any pumice residue that you might have missed.
Clean your toilet regularly to prevent a build-up of mineral scale.