If your metal looks like it went scuba diving in a limestone cave, you might need a poultice paste. Mix baking soda with enough lemon juice or vinegar to make a thick paste—it should look like frosting for a weird science cookie.
Spread that paste over the deposits and let it dry completely (usually an hour or two). As it dries, it pulls the calcium out from the microscopic pores of the metal. Then just scrub it off—it’s oddly satisfying, like peeling dried glue off your hands.
Heads up: never use abrasive steel wool on stainless steel, aluminum, or chrome. You’ll scratch the finish, and then you’ll have ugly scratches to match your old deposits. Use a soft cloth or a non-scratch scrub pad instead.
Calcium Removal From Faucets at Maggie Martinez blog
What about tough cases like brass or copper?
If you’re dealing with brass or copper (maybe a vintage doorknob or a fancy kettle), vinegar can actually discolor them—it can turn them a weird pink or green. Instead, make a paste with lemon juice and cream of tartar (or just lemon juice and salt).
Rub it gently, let it sit for five minutes, then rinse. This will dissolve the calcium without eating away the metal’s patina. Your antique hardware will thank you with a little sparkle.
Another pro tip: WD-40 isn’t just for squeaky doors. Spray it on a cloth and wipe down calcium deposits on metal tools or outdoor fixtures. The lubricant breaks the bond between the crust and the metal, making it easier to wipe off.
I’ve actually used WD-40 on a rusty old garden hoe, and it worked better than I expected—the calcium flaked off like dead skin after a sunburn. TMI? Probably, but you get the point.
