How do I get rid of a water stain on a quartz kitchen countertop?

A quartz kitchen countertop is stain resistant but not stain proof, meaning liquid left too long can cause discoloration. Usually, the culprit is water from glasses and cooking. To remove water stains, try making a paste of baking soda and water about the consistency of peanut butter. Use a sponge to gently work the the mixture onto the water stain in a circular motion. If this does not remove the stain, smear the same mixture directly over the stain. Cover the stain and mixture with plastic wrap to hold the it in place. The heat trapped under the plastic will pull the stain out of the quartz. Leave to sit overnight, and rinse in the morning.