How to Clean a Concrete Birdbath

A common recipe for birdbath cleaning is one part bleach to 10 parts water, yet there are effective environmentally friendly alternatives. The right birdbath location and a routine for regular maintenance makes cleaning the easily stained concrete less of a chore. A neglected birdbath can harm birds by spreading disease. Keep three basic household products on hand for bird-safe concrete birdbath care that's also friendlier to the environment.

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Step 1

Empty the birdbath once a week and scrub the inside surface with a stiff-bristled brush and mild soap. This keeps the concrete clean if the bath is well-maintained with daily water changes.

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Step 2

Pour at least 1 cup of undiluted white vinegar into the birdbath once or twice a month for algae removal if buildup occurs. Add more vinegar if needed to cover the bath's bottom. Clean the concrete with vinegar more often in the summer, if necessary.

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Step 3

Scrub the concrete with a wire brush in two or more directions to loosen algae, mildew and soiling. Rinse the birdbath thoroughly with a hose.

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Step 4

Mix 1/4 cup of borax in two cups of hot water, stirring with a spoon. Pour the mixture into the birdbath. Borax kills mold and mildew and helps remove stubborn stains. Scrub the mixture into the concrete with a wire brush.

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Step 5

Rinse the birdbath at least twice to remove all the residue. Refill it. Limit the water depth to 2 to 3 inches. Birds prefer low water and will avoid a birdbath when the water is too deep.