To remove calcium deposits from your toilet bowl simply turn of the water supply valve located behind the toilet.
Flush the toilet to only allow enough water to the bowl to flush it, leaving very little water in the bottom of the
bowl. Pour vinegar to the normal water level of the toilet bowl. Place paper towel around the inside of the bowl
to the rim of the bowl. Close the lid, turn on the fan and let stand for 4 hours or longer. Flush and clean with Comet