You should soak a faucet aerator in warm white distilled vinegar for between 30 to 60 minutes. This duration gives the mild acetic acid sufficient time to penetrate and dissolve stubborn hard water calcium, lime, and mineral scale crust. If the aerator is heavily encrusted with thick mineral buildup, you can safely let it soak overnight without risking damage to the plastic or metal components. Verification: Check that the white mineral crust has softened into a chalky residue that brushes off easily with an old toothbrush.
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