What Does Bleach Do To Quartz Countertops?

Quartz countertops are popular in many homes due to their durability, aesthetic appeal, and low maintenance. However, even quartz can get stained over time. Some homeowners may try using bleach to remove stains from their quartz countertops, but this can actually damage the material. Here is a detailed look at what bleach does to quartz countertops and why it should be avoided.

How Quartz Countertops Are Made

To understand how bleach affects quartz, it is helpful to first understand what these countertops are made of. Quartz countertops are engineered stone composed of ground natural quartz crystals combined with resins, polymers, and pigments.

The exact combination varies by manufacturer, but a typical quartz slab contains:

  • 90-94% ground quartz
  • 6-10% resins and polymers that bind the quartz together
  • Pigments for color

The resins form the counter surface while the quartz pieces provide strength and durability. This combination creates a material that is non-porous, stain resistant, and resilient.

The Effects of Bleach on Quartz

While quartz itself is bleach-resistant, the resins used in manufacturing are not. Bleach can break down and erode the resin binders in quartz countertops. This damage may not be immediately visible, but over time bleaching can cause:

  • Discoloration and fading of pigments
  • Rough texture from resin erosion
  • Cracks and pits as the binders break down
  • Loss of shine and luster

The erosive effects of bleach worsen with repeated exposure over months and years. Even dilute bleach solutions can degrade quartz resins with regular use.

Why Bleach is Used on Quartz

Homeowners sometimes use bleach when trying to remove stains from quartz counters. However, bleach is ineffective at stain removal because quartz is non-porous.

Common reasons homeowners may try bleaching quartz:

  • Trying to whiten a stained surface
  • Attempting to disinfect the countertop
  • Removing residues from cooking or cleaning

While bleach can temporarily lighten or disinfect, it does not effectively remove stains from quartz. Any lightening is superficial and will not penetrate stains that have bonded to the surface.

Safe Cleaning Alternatives for Quartz

To safely clean and care for quartz countertops, follow these guidelines:

  • For everyday cleaning, use a mild soap and water. Rinse well.
  • Disinfect with a 70% isopropyl alcohol solution.
  • Remove stuck-on residue with a non-abrasive scrubbing pad.
  • Spot treat minor stains with a hydrogen peroxide paste. Rinse thoroughly.
  • Avoid abrasive cleaners, scouring pads, and alkaline cleaners.

Vinegar, hydrogen peroxide, and alcohol provide sanitizing and light stain removal without damaging quartz resins. For stubborn stains, consult a professional stone cleaner.

Signs of Bleach Damage on Quartz

If bleach has already been used on your quartz countertops, look for these signs of damage:

  • Fading or blotchy discoloration
  • Small cracks or pits in the surface
  • Areas that feel rough or uneven to the touch
  • Loss of reflective gloss

The degree of damage depends on the bleach concentration and how often it was applied. But any signs indicate the resins are eroding. To prevent further damage, stop using bleach immediately.

Restoring Bleach-Damaged Quartz

If you catch bleach damage early, it may be possible to restore the quartz appearance. Options include:

  • Professional polishing to smooth damaged areas and renew gloss.
  • Re-sealing with a resin-based sealant to protect against contaminants.
  • Resurfacing severely damaged areas with an engineered quartz overlay.

However, if damage is extensive, a full countertop replacement may be needed. Preventing bleach damage in the first place is more prudent than attempting to restore a seriously degraded surface.

Maintaining Your Quartz Countertops

To get the most out of your quartz investment:

  • Clean with mild pH-neutral soaps and detergents.
  • Rinse thoroughly after cleaning.
  • Blot spills quickly to prevent stains.
  • Avoid placing hot pots/pans directly on the surface.
  • Use trivets under appliances that generate heat.
  • Re-seal every 1-2 years for optimal protection.

Proper care will ensure your quartz countertops stay beautiful and damage-free for years. Skip the bleach and use gentle cleaning methods to maintain their pristine factory finish.

Frequently Asked Questions About Bleach and Quartz Countertops

Can I use bleach to clean my quartz countertops?

No, bleach should never be used to clean quartz counters. The chemicals in bleach will erode and degrade the resin binders in quartz over time.

What kind of damage does bleach cause on quartz?

Bleach causes discoloration, fading, erosion of the resin binders, cracks, pits, loss of shine and luster, and an uneven texture on quartz surfaces. The damage worsens with repeated bleaching over time.

Why does bleach damage quartz if it’s supposed to be stain resistant?

While quartz itself is resistant to bleach, the polymer resins used in making the countertops can be degraded by extended contact with bleach. Avoiding bleach prevents this binder breakdown.

Are there any household cleaners that are safe for quartz?

Yes, mild soaps, hydrogen peroxide, alcohol, and vinegar all safely clean quartz without harming the resins. Avoid harsh alkaline cleaners and abrasives.

How can I restore my quartz countertop if it was damaged by bleach?

Professional polishing, re-sealing, and resurfacing are options for repairing early bleach damage. But extensive degradation will likely require a full quartz countertop replacement.


Quartz offers an attractive and durable countertop option when properly cared for. While the quartz itself is bleach-resistant, the adhesives are not. Bleach breaks down the resin binders, leading to erosion, loss of shine, discoloration, and eventual cracking. To keep quartz looking its best, avoid bleach and use mild cleaners. With the right care, your quartz countertops will stay beautiful for many years.