Remove Hard Water Stains and Mineral Deposits from a Kitchen Sink

Hard water stains are calcium and magnesium deposits left behind when mineral-rich water evaporates. They build up on sink surfaces, faucets, and around the drain, leaving chalky white, orange, or rust-colored rings that look like neglect even on a clean sink. The good news is they're not permanent damage—they're just mineral sediment, and acid breaks them down fast. You don't need harsh chemicals or a plumber. An afternoon with vinegar and a scrub brush gets your sink looking new again, and the method works whether your sink is stainless steel, porcelain, or composite material.

1. Start with a dry slate. Remove all dishes, soap dispensers, and debris. Dry the sink completely with a clean cloth. Water sitting on the surface will dilute your cleaning agents, so getting it completely dry is the first real step.
2. Let acid do the work. Pour undiluted white vinegar directly onto the stained areas. Let it sit for 15 to 30 minutes. For a hands-off soak, you can also fill the sink with vinegar and submerge stainless steel parts like the strainer basket or faucet aerator. The acetic acid dissolves mineral deposits without scrubbing.
3. Gentle pressure wins. After soaking, scrub the stained areas with a soft-bristled brush, non-abrasive sponge, or microfiber cloth. Work in the direction of the grain if it's stainless steel. Light to medium pressure is enough—the vinegar has already softened the deposits. Rinse as you go to see the results.
4. Fizz through the crust. For thick, crusty deposits that vinegar alone won't shift, mix baking soda and white vinegar into a thick paste (roughly equal parts). Spread it directly onto the stained area and let it sit for 20 to 45 minutes. The fizzing reaction helps break down heavy mineral layers. Then scrub gently and rinse.
5. Don't forget the flow restrictor. Unscrew the aerator (the screen at the faucet tip) and soak it in a cup of vinegar for 30 minutes. Use an old toothbrush to scrub the fine mesh. For the faucet body, wrap it loosely in a vinegar-soaked paper towel and let it sit. This removes deposits inside the aerator that affect water flow.
6. Dry stops the next batch. Run warm water over every surface you treated, flushing vinegar and baking soda residue from the sink, drain, and faucet. Wipe the entire sink and faucet dry with a clean cloth. Mineral deposits return faster to wet surfaces, so drying is part of the prevention.
7. Restore the factory finish. For stainless steel, wipe down the dry sink with a microfiber cloth in the direction of the grain. This removes streaks and brings back the factory finish. For porcelain or composite, just buffing dry with a soft cloth is enough.