How to Remove Grout Stains from Quartz Countertop

Removing grout stains from quartz countertops can seem daunting, but with the right techniques and products, it can be done! Quartz is an extremely durable material, but it is still prone to staining from grout during installation or repairs. Don’t panic – follow these steps to safely and effectively eliminate those unsightly marks.

What Causes Grout Stains on Quartz?

Grout stains on quartz are caused when the porous grout material absorbs moisture and then transfers pigment onto the surface of the quartz. Grout contains minerals and pore spaces that allow it to absorb liquid, which can pick up dirt and discoloration over time. When the grout comes into contact with quartz, it can leave behind a stain. Here are some common causes of grout stains on quartz:

  • Grout spills and smears during installation of new countertops
  • Excess grout that isn’t cleaned off properly after repairing existing grout lines
  • Moisture seeping into porous grout over time, picking up discoloration
  • Dirty grout lines that transfer color when they touch the quartz surface

No matter the cause, grout stains often look like faint discolored rings or smears on the quartz. The good news is that with a bit of elbow grease, you can remove them completely.

Cleaning vs. Removing Grout Stains from Quartz

Cleaning grout stains involves simply wiping down the surface of the quartz to remove loose debris and excess staining. However, this is often not enough to fully remove absorbed stains from the quartz material itself.

To completely remove stubborn grout stains from quartz, you need to use more intensive treatments designed to lift the pigment that has soaked into the quartz. This usually means scrubbing with solvents or chemicals designed to dissolve and draw out the stain.

The process may take some time and effort, but you can fully extract pesky grout stains with the right products and techniques. Cleaning alone won’t cut it!

Step-by-Step Instructions

Follow these steps to safely tackle and eliminate those annoying grout stains from your beautiful quartz countertops:

1. Try Cleaning First

Start by trying to clean the stained area with warm, soapy water and a soft cloth. This may remove excess pigment sitting on top of the quartz.

Mix a few drops of dish soap with warm water, dampen a soft cloth, and gently wipe the stain. Rinse well with clean water and dry with a towel. Repeat as needed.

If this alone doesn’t remove all of the discoloration, move on to more heavy-duty stain removal.

2. Choose a Stain Remover

You’ll need a chemical stain remover formulated to dissolve and lift grout pigment from natural stone and quartz. Some good options include:

  • Bar Keeper’s Friend
  • ZEP Grout Stain Remover
  • Granite Gold Stain Remover
  • CLR Calcium, Lime, and Rust Remover

Avoid bleach and harsh cleaners like toilet bowl cleaners, which can damage the quartz surface. An oxygen-based cleaner is your best bet for quartz.

3. Test on an Inconspicuous Spot

Before applying your chosen stain remover to the main stain, do a test spot on an inconspicuous area of the quartz. This will ensure the product doesn’t etch or discolor the quartz.

Allow the test area to dry completely, then inspect for any damage. If all looks well, move ahead to the stained area.

4. Apply Stain Remover

Follow the product instructions to dilute if necessary. Apply a generous amount directly onto the grout stain, making sure to completely cover it.

Let it sit for 5-10 minutes so it can penetrate and work on dissolving the pigment. Reapply if needed.

5. Scrub the Stain

Use a soft brush or sponge designated for non-scratch cleaning to gently scrub the stained area. Apply light pressure and work in a circular motion.

Continuously wipe up excess moisture and stain residue with clean water and dry towels as you scrub.

Keep scrubbing until you see the stain fading and lifting from the quartz. This may take some time and elbow grease for stubborn stains.

6. Rinse and Dry

Once the stain appears gone, rinse the area thoroughly with warm water. Make sure to remove all cleaner residue.

Dry completely with a soft, lint-free cloth. Inspect closely to ensure the stain has been successfully removed.

7. Reapply if Needed

If any stain remains, repeat the process by reapplying the cleaner, scrubbing, and rinsing until it is completely gone. Persistence and patience are key!

With the right stain remover and some determined scrubbing, you can conquer those grout stains!

Tips for Prevention

Once you’ve successfully removed grout stains from your quartz, keep them away for good with these preventive tips:

  • Seal grout lines annually to protect from moisture damage
  • Immediately wipe up spills and messes on quartz
  • Use a grout saw instead of a grout knife for repairs to minimize transfer
  • Apply masking tape along edges before grouting to keep grout off the quartz
  • Clean quartz and grout regularly with gentle soap and water
  • Avoid abrasive pads or scrubbers that could etch the quartz surface

With proper care and maintenance, you can keep your beautiful quartz countertops in pristine condition for years to come!

Frequently Asked Questions

What causes grout stains on my quartz countertop?

Grout stains on quartz are caused by the pigment and minerals in grout transferring onto the surface of the quartz when the two make contact. Moisture allows the grout to absorb discoloration over time, which can then leach onto the quartz.

What is the best way to remove grout stains from quartz?

Using a specially formulated grout stain remover, like Bar Keeper’s Friend, along with some thorough scrubbing is the most effective way to fully remove absorbed grout stains from quartz. Harsh bleach or acid cleaners can damage quartz.

How can I prevent future grout stains on my quartz countertop?

Preventive measures like sealing grout annually, wiping spills quickly, taping off quartz before grouting, using a grout saw instead of knife, and regular gentle cleaning of quartz and grout will help prevent stains.

Can I use bathroom cleaner or bleach to remove grout stains from quartz?

No, avoid using bathroom cleaners, tile cleaners, bleach, or acid-based cleaners on quartz countertops. They can etch or discolor the quartz. Use an oxygen-based stain remover specifically formulated for natural stone and quartz.

What should I do if the grout stain remover damages my quartz?

Immediately rinse the area with clean water if you notice etching or discoloration. Stop using the product. Consult with a quartz professional, as you may need to polish the quartz surface to repair the damage. Always test products first.


Removing pesky grout stains from quartz may take some work, but the results are well worth the effort. With the right oxygen-based cleaner and some repeated scrubbing, you can lift those absorbed stains and restore the pristine beauty of your countertops. Be sure to take preventive measures to keep grout stains away for good!