Rust stains can mar a ceramic kitchen sink. Sometimes, no matter how careful you are, you may end up with a few rust stains. These aren't difficult to remove, but if you use an improper method you can wind up scratching and marring the sink further. Here's a simple way to remove stains without creating more damage.
Step 1 - Apply the Salt
Wipe the sink to remove any large debris and grime. Dry the sink and close the drain plug. Use the salt to cover the rust stain. If the stain is in an awkward place you can wet the salt so it will stick. Add the lemon juice to the salt, and allow it to stand for at least 2 hours. Go back and use a soft cloth to rub the salt out of the area. This may take some elbow grease to remove the stain.
Step 2 - Try Vinegar
If the salt and lemon didn't pull the stain out, you can try vinegar. Soak a towel or sponge in the vinegar and place it on the stain. Allow this to set overnight, and then rinse the sink.
Step 3 - Pumice Stone
When all else fails, you can try a pumice stone. You need to wet the stone first, so it won't scratch the ceramic surface. Run the stone over the stain several times, stopping to check your progress every few runs.