Diatomaceous earth can be used as an abrasive for cleaning and polishing. The silica which makes up DE is an extremely porous and fine powder, yet very hard. This makes it ideal for integrating into cleaning faucets and showerheads to combat hard water stains.
Follow the steps below to learn how to polish out hard water stains with DE.
Make a polishing paste by adding a few drops of lemon, vinegar, or vegetable oil (or all of them) to DE. You want the DE to begin to dampen slightly.
Dip a damp cloth into the DE mixture.
Rub the faucet with the cloth and DE in a circular motion applying varying pressure as needed. Repeat until the faucet is cleared of hard water stains.
Rinse the faucet and dry immediately.
Note: You can also use this process in other areas with hard water stains like shower doors and tiles.