Each time you flush, these areas of the toilet get wet. When the water evaporates, it leaves behind an ultra-thin film of minerals. Dirt can easily attach itself to this coarse film.

Use the toilet brush to get under the rim and over stains above the water line. Let this sit for about 10 to 30 minutes to break down the stains.

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That residue can end up in the dry parts of your toilet bowl, too, but if your toilet is white, you probably don’t notice it. It’s much harder to ignore brown or rust-colored rings or stains ...

Sometimes, despite your best efforts, hard water deposits still settle inside a toilet, especially along the water line. For these tough-to-remove stains, try a toilet cleaning stone, like the ...

This post has been updated. It was originally published on 8/18/2018. One of the most common problems in all of chemistry and materials science: stain removal. From a scientific perspective, oil ...