Bathroom sink drains can become clogged from hair, globs of toothpaste, and soapy residue. Fortunately, you don't need to call a plumber to unclog and clean the drain if you do regular cleanings.

Pour 1/2 cup of dish soap (it doesn't have to be Dawn, but should be a soap that cuts grease) down the drain, followed by the boiling water. “Be careful not to splash yourself," San Angelo warns.