Sprinkle baking soda generously over all damp surfaces of the sink, including the bottom, sides, and back ledge. For a standard double-basin sink, ½ cup is typically sufficient. The baking soda will form a paste-like consistency with the residual water.

Using a damp sponge or soft cloth, scrub the sink in circular motions. Pay special attention to the drain opening, faucet base, and corners where grime accumulates. The mild abrasion of baking soda will lift stains and residue without scratching. For hard water rings or dried soap scum, let the baking soda paste sit for 5–10 minutes before scrubbing.

Remove all dishes, strainers, and mats from the sink. Rinse the sink with warm water to loosen surface debris. If the sink has a garbage disposal, run cold water for 10 seconds to clear loose particles.

Dry the sink completely with a clean towel to prevent new water spots or mineral deposits.

Rinse the sink thoroughly with hot water to remove all baking soda residue. For a polished finish, wipe the sink with a slice of fresh lemon (the citric acid enhances shine) or sprinkle a small amount of baking soda onto a dry microfiber cloth and buff the surface.