Check out these easy methods to get rid of the yellow stains.
1) Most stains can be handled with a warm soapy water rinse. But with some, hydrogen peroxide and a clean cloth can do the job.
2) For extreme stains, make a paste of 1 teaspoon of baking soda with a cup of warm water. Apply the paste on the counter, cover it with cling wrap plastic and keep it overnight. Next morning, wipe it with warm water and a clean cloth.
3) For stains on the gaps of the tiles, flush the area with water and mild soap, followed by a gentle, dry wipe.