My tenant left this for me. What’s the best way to get rid of lime and rust in a sink?

Natural Solutions
1. Combine white vinegar and baking soda to form a paste.
2. Apply the paste to the stained areas and let it sit for 15-20 minutes.

3. Scrub the area with a brush and rinse with warm water.
Use Lemon Juice
1. Cut a lemon in half and apply the juice directly onto the lime or rust stains.
2. Let it sit for about 10 minutes for the citric acid to break down the stains.
3. Scrub and rinse with water.