To remove water stains from Quartz kitchen counters, follow these steps:

1. Mix equal parts vinegar and water in a spray bottle.

2. Spray the solution onto the affected area and let it sit for 10-15 minutes.

3. Using a soft cloth or sponge, gently scrub the area in a circular motion.

4. Rinse the area with water and dry it with a clean towel.

5. If the stain is still visible, repeat the process until it disappears.

Note: Avoid using abrasive cleaners or scouring pads, as they can damage the surface of the Quartz.