Toilet bowls accumulate mineral buildup quickly, especially when your home has a hard water supply. The key to removing the buildup is to first get rid of any existing residue, then implement a regularly scheduled cleaning of the toilet bowl. By cleaning the bowl regularly, you are removing the residue as quickly as it develops, making it unnoticeable to the common eye. Instead of purchasing chemically-based toilet bowl cleaning products, use inexpensive alternatives such as vinegar and baking soda.
Pour 2 cups white vinegar into the bowl along with 1 cup of baking soda. Let sit for 10 minutes.
Scrub the toilet bowl with a toilet bowl brush. In many instances this will remove all buildup. Flush the toilet.
Mix a baking soda and vinegar paste by mixing 1 cup of baking soda and 1/4 cup of vinegar in a bowl.
Spread the paste over the areas of buildup and let sit for 30 minutes.
Scrub the toilet bowl again with the toilet brush, then flush the toilet.