How to Remove Hard Water Stains from a Granite Countertop: A Surface-Safety Guide

• Baking soda paste: Mix a small amount of baking soda with water to form a paste. Apply it to the stain, let it sit for 5–10 minutes, then gently wipe with a soft cloth. Baking soda is mildly abrasive but safe for granite if used gently. Avoid rubbing too hard.
• Commercial stone cleaner: Look for a pH-neutral cleaner specifically designed for natural stone. These are formulated to be safe and effective on granite.
• Call a professional: If the stains are deep or widespread, a professional stone restorer can safely polish the surface and reapply sealant if needed.

How to Prevent Future Hard Water Stains

Prevention is the best way to keep your granite looking new. Here are some tips:

• Dry the countertop after use. Keep a dry cloth near the sink and wipe up water splashes immediately.
• Use a water softener. If you have hard water, a whole-house water softener can reduce mineral content and prevent stains.
• Reapply sealant regularly. Granite sealant wears off over time. Test your countertop by sprinkling a few drops of water on the surface—if it soaks in quickly, it's time to reseal. Follow the manufacturer's instructions for your sealant.

When to Stop and Call a Pro

If you've tried the gentle methods and the stains remain, or if you notice etching (dull spots) or discoloration, stop and consult a professional. Harsh DIY methods can cause permanent damage. A professional can assess the condition and recommend the best course of action, which might include polishing or resealing.

Hard water stains on granite are a common nuisance, but with the right approach, you can keep your countertop looking beautiful. Remember to always use gentle, pH-neutral cleaners and avoid acidic substances. With regular care and prompt cleanup, you can prevent these stains from becoming a permanent eyesore.