Yes, you can safely leave white vinegar on your faucet overnight to tackle heavy, stubborn mineral scale and calcium crust. Because household white vinegar is a mild acetic acid (about 5%), it will not damage chrome, stainless steel, or brass finishes during an extended soak. However, avoid leaving vinegar in contact with natural stone countertops underneath the faucet overnight, as acid can etch stone. Verification: Wipe the faucet down with a damp cloth in the morning to confirm all softened mineral scale washes away cleanly.
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