Can You Use Comet on Quartz Countertops?

Quartz countertops are an incredibly popular choice for kitchens and bathrooms due to their durability, aesthetics, and ease of maintenance. While quartz is remarkably stain, scratch, and heat resistant, proper cleaning is still required to keep these counters looking like new. Some homeowners prefer using harsh chemical cleaners like Comet to clean their quartz. But is this advisable? Here is a detailed look at whether Comet is safe for cleaning quartz countertops.

What is Comet Cleaner?

Comet is a powdered abrasive cleaner that contains bleach along with other harsh chemicals like chlorine and hydrochloric acid. It is designed to scrub away tough stains and buildup. When mixed with water, Comet forms a frothy paste that can tackle stuck-on messes. It is commonly used for cleaning sinks, tubs, tile and porcelain.

Comet works by using mild abrasives and bleaching agents to literally scour surfaces clean. The gritty texture scrubs the grime away, while the chlorine bleach helps whiten and disinfect. It can be highly effective at cleaning grout, fiberglass, stainless steel and other sturdy surfaces. But such an abrasive formula may not be well-suited for more delicate materials like natural stone or quartz.

Is It Safe to Use Comet on Quartz?

Most manufacturers do not recommend using Comet or other harsh scrubbing compounds on quartz counters. Here’s why:

  • Abrasives in Comet can scratch quartz – While quartz is very durable, it can still get scratched by abrasive cleaners. The mineral particles in Comet could leave light scratches on the surface over time.
  • Bleach can discolor quartz – The bleach in Comet may cause discoloration or blotchiness on quartz surfaces. This damaging effect becomes more pronounced with repeated exposure.
  • Acids can etch quartz – The hydrochloric acid in Comet can potentially etch or corrode quartz, leaving a hazy, damaged appearance. Acid-based cleaners should always be avoided.
  • Voids manufacturer warranties – Using Comet or other unsuitable cleaners may void the manufacturer’s warranty for your quartz countertops. It’s best to follow their care instructions.

While Comet powder seems like a quick and easy cleaning solution for quartz, it’s generally not worth the risk of damaging an expensive countertop surface.

Recommended Cleaning Agents for Quartz

To safely clean quartz countertops without causing etching, scratches or discoloration, use only pH-neutral cleaners free of bleach, acids and abrasives. Here are some good options:

  • Mild dish soap – A few drops of plain dish soap mixed with warm water makes an everyday quartz cleaner.
  • 50/50 vinegar and water – For disinfecting, a diluted vinegar solution works well and rinses cleanly.
  • pH-neutral stone cleaner – Look for specialty stone cleaners at hardware stores that are formulated without acids or bleach.
  • Hydrogen peroxide – Hydrogen peroxide can help remove some stains and is quartz-safe when diluted.

Always refer to the manufacturer’s care guidelines before choosing any new cleaning product for quartz. And be sure to rinse thoroughly after cleaning to remove any residue. With the proper gentle cleaners and techniques, quartz countertops can stay gorgeous for decades.

FAQs About Using Comet on Quartz

Is it okay to use Comet on quartz every once in a while?

No, Comet should be avoided entirely on quartz surfaces. Even occasional use of the abrasive formula can progressively damage and scratch your counters over time. It’s better to stick to gentler cleaning products meant for stone.

What happens if Comet is accidentally used on quartz?

Rinse thoroughly with water right away to minimize exposure. Some minor etching or discoloration may still occur. Make sure to use only recommended quartz cleaners going forward to prevent further damage. Avoid bleach or acid-based cleaners.

Can I use a soft Comet pad on quartz?

No, you should not use Comet cleaning pads on quartz either. The abrasive pads could potentially scratch the surface even if used gently. Soft microfiber cloths are ideal for wiping quartz down.

Is it okay to use Comet on just a small area of quartz?

It’s best not to use Comet on any area of your quartz counters. The chemicals can cause localized damage to the surface. Stick to cleaners specifically designed for quartz instead for a uniformly pristine appearance.

Can I use a mix of Comet and vinegar to clean quartz?

No, you should never mix Comet with vinegar or any other cleaner for use on quartz. Vinegar and Comet together produce toxic chlorine gas fumes that can be very dangerous if inhaled.


Quartz countertops offer gorgeous, low-maintenance surfaces, but do require some special care. While Comet may be your go-to for scrubbing tile or stainless steel, it should be avoided on quartz. The caustic formula carries a high risk of etching, discoloring or dulling quartz over time. For the best results, always use mild, non-abrasive pH-neutral cleaners specifically designed for quartz and other engineered stone. With proper routine cleaning and care, your beautiful quartz counters can stay looking like new for many years before needing professional restoration.