Quartz is known for its resistance to staining, but some persistent substances like ink, oil, and dye can penetrate the surface and leave stubborn stains. Here are some effective ways to remove stains from quartz countertops:

1. Dish Soap and Water - The easiest way to remove light stains is to mix a few drops of dish soap with warm water and wipe off the countertop with a soft cloth.

2. Baking Soda and Water - For tougher stains, make a paste of baking soda and water and apply it to the stained area. Let it sit for 10-15 minutes and then scrub with a soft-bristled brush and rinse with water.

3. Rubbing Alcohol - For ink stains, soak a cloth in rubbing alcohol and dab the stain gently until it comes off.

4. Hydrogen Peroxide - For tough stains like blood or wine, mix hydrogen peroxide with a few drops of dish soap and apply it to the stain. Wait for 10-15 minutes and then scrub with a soft-bristled brush and rinse with water.

5. Glass Cleaner - For oil-based stains, spray a generous amount of glass cleaner on the stain and let it sit for a few minutes. Wipe it off with a soft cloth and rinse with water.

Note: Avoid using abrasive cleaners or scrubbers that can damage the surface of the quartz countertop.