Sink and toilet porcelain stain removal

To remove stains from porcelain sinks, tubs or toilets, make a paste of cream of tartar and hydrogen peroxide. Let the paste sit on the stain for an hour, then lightly scrub it off. The stains should disappear. You could also try saturating paper towels with bleach or a peroxide based cleaner and place the towels over the stains for 30 minutes. Rinse well.