Repair and Remove Stains From Porcelain
Rust stains and minor chips leave old porcelain fixtures looking worn, but they may still have life left in them, even without professional refinishing. Try rejuvenating fixtures yourself.
To remove rust stains, apply baking soda with a damp sponge to the stain. Scrub gently in circles. Rinse thoroughly so that no residue is left. If ineffective, make a paste of Borax and lemon juice and apply; let dry. Rinse thoroughly. Another option for white fixtures only (never use on colored porcelain): Line fixture with paper towels. Open a window or use a ventilation fan. Close drains, and slowly pour chlorine bleach over paper towels; let soak overnight. Discard towels and rinse the fixture thoroughly. To protect porcelain from future staining and give it a shine, rub lemon oil on with a clean cloth. Do not apply to the inside bottom of the tub, to avoid a slippery surface.
To repair chips, clean fixture with mild soapy water and dry with a clean cloth. Coat the chip with rubbing alcohol and leave for an hour. Using 400- or 600grit wet/dry sandpaper, sand inside the chip to help the filler adhere. Avoid sanding surrounding area. Wipe with a clean cloth. Choose a porcelain repair kit in a color that matches the fixture. If color is a difficult match, create a custom mix—for instance, mix white filler with almond for a cream color.
Mix the two epoxies for the filler as directed. Apply a thin layer of the filler to the chipped area with the small applicator brush or a toothpick. Let dry. Lightly sand the spot smooth. Repeat process until the chipped area is level with surrounding porcelain. Before the final layer has completely dried, lightly sand for a smooth surface. Let dry 24–72 hours, per manufacturer’s instructions. Avoid scrubbing the repaired spot for a week to ensure bonding.