Rust stains are a problem commonly encountered by people who have ceramic or porcelain sinks or bath tubs. These stains are caused by aging of the material, along with the constant exposure to water. One of the most effective removal methods involves using toothpaste and baking soda.
Clean sink thoroughly using warm water and a cleaner that does not contain bleach. Dry the surface with a towel.
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Mix one part toothpaste with one part baking soda into a thick paste. The amount used will be dependent on the size of the rust stain. One tablespoon of the mixture will remove a few square inches of rust.
Apply a thick layer of the paste to the rust stain and allow to sit for 10 minutes.
Scrub vigorously with a tooth brush or scrub pad until the rust stain begins to loosen.
Rinse the sink with cold water and repeat steps 3 and 4 if necessary.