Just 3 Steps to remove rust stains.
Step 1: Squeeze lemon juice directly on the stain.
Step 2: Sprinkle a liberal amount of salt on the lemon juice.
Step 3: Let sit for about 4 hours and then rinse with cool water. Get all the salt down the drain before you start scrubbing. Just use your soft sponge and a little dish soap to wash all the residue off. The stains should be gone!