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Dentists generally recommend discarding a toothbrush after three months’ use. While that old brush might no longer be up to the job of cleaning your pearly whites, it makes a great mini scrub brush for getting at the dirt in corners, crevices and other tight spots that sponges, pads and larger brushes miss.

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Old toothbrushes will safely clean most surfaces, with the possible exception of latex paint. They’re not a good choice for grout cleaning, either, unless you’re interested in working on that tile wall for a long, long time. Invest in a larger grout brush for this task.

Simply apply a spot of your favorite liquid cleaner to the old brush, and get busy. Just don’t mix up old and new toothbrushes!