Pour 2 cups of warm water into a bowl. Add 1/2 teaspoon of dishwashing detergent. Stir the ingredients together to make a soapy solution.
Dampen a sponge in the soap solution. Wring out excess moisture.
Wipe off your quartz countertop surface with the detergent solution to remove stains and dirt. Moisten a damp cloth with water and wipe the countertop to rinse it. Dry the surface with another cloth.
Fill a bucket with 1 gallon of warm water. Add 1/4 cup of bleach.
Put on rubber gloves to protect skin from the drying effects of household bleach. Saturate a clean cloth in the diluted bleach solution. Squeeze out excess moisture.
Wipe down your quartz countertop with the bleach solution. Allow the bleach solution to remain on your countertop for one minute to kill germs and bacteria.
Rinse the countertop with a damp cloth. Dry the surface with another cloth.