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