General-purpose metal cleaner will restore the shine on the exterior housing of an un-lacquered deadbolt lock, but avoid getting polish inside the mechanism. Use a sponge or soft cloth and a gentle household cleaner to polish up lacquered metals, such as brass. Abrasive pads or cleansers will damage the lacquer.
Keep a paper towel square handy whenever you use penetrating oil to wipe up inevitable overspray and drips.
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