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Eileen asked: How do I clean quartz kitchen sinks? In redoing our kitchen, we opted for quartz countertops and sink. The tops are no problem. They are glossy and easy to clean. The sink, however, has a matte finish and absorbs everything. We have tried soft cleansers, but it never looks clean.
Routine 
cleaning with a mild detergent should keep your quartz sink in top condition, but for those times when you need a deeper, more thorough clean, you can’t beat this method. It’s ideal for removing film and build-up that may be left by regular cleaning and will leave your sink gleaming.
You Will Need:
- Bar Keepers Friend
- Nylon brush
- Water
- Towel
Steps to Clean the Sink:
- Moisten the surfaces to be cleaned. A spray nozzle works well for this.
- Sprinkle Bar Keepers Friend powder over the damp surfaces.
- Scrub the surfaces with a nylon brush. Add more water if needed to keep the cleaner from drying on the surface of the sink.
- Rinse thoroughly with clean water. Use a soft cloth or the nylon brush to wipe away any residue as you are rinsing.
- Dry with a towel.
- Repeat if needed until all of the stains are removed.
Additional Tips and Advice
- If your sink has a white residue on it after each use, that is cause by hard water. This problem can be fixed in a variety of ways: installing a home water softener, installing a water filter on the faucet and using the filtered water for the final rinse, installing a distilled water faucet on the sink and using the distilled water to rinse, spraying down the sink after each use with distilled water, or drying the sink thoroughly after each use.
- If preferred, white vinegar can be used to clean the sink or the dishes in it. Put one part vinegar and two parts water in a spray bottle and use as needed.
- Never use strong alkalis such as ammonia or caustic soda solutions to clean quartz. You should also avoid use of drain unclogging chemicals which require you to fill the sink while they work.
- Don’t clean with harsh abrasive powders or pads. The scratches they leave behind will make your sink more susceptible to stains.
- Clean the sink regularly with a mild detergent (or as recommended by the manufacturer). Wipe smooth surfaces with a clean cloth, and use a nylon brush in the textured areas.
- Bar Keepers Friend is available at most major supermarkets and hardware stores, as well as online. For this purpose, it is best to use the powdered version.
Thanks for the info on cleaning a quartz sink with Bar Keep, but it didn’t work. Any other suggestions?
I used Bar Keepers Friend and my sink looks like new. I get white spots that must be from hard water. I will have to get a filter for my faucet.
Don’t mean to butt in, but I have same problem. We installed new quartz countertops and a quartz composite sink several years ago and that sink has been very hard to keep looking clean. I’ve used soft cleaners of all types. I was told by installers to use baking soda and vinegar with a soft cloth. You say not to use baking soda. I know coffee stains, so I’ve always been so careful to pour coffee straight down the drain, but I still have discoloration. I almost wish I hadn’t taken out my stainless steel sink. It shined all the time.
I cannot clean my new quartz sink. Is there a coating that can be applied over the quartz to make the sink useable again?
Ann,
Since I am not sure why you are unable to clean the sink, I cannot recommend a solution for the problem. In general, quartz does not need to be sealed because it is nonporous. It sounds like you are looking more for a paint to cover up the quartz than for a sealant though. Although you can paint over quartz, you will need to prep it (etch it) for the paint first, and then be sure that you use a paint and sealant that is not only capable of resisting all the water and scrapes from dishes, but also is not going to release any harmful chemicals onto the dishes. Be sure to let your hardware store associate know about those two concerns when you are selecting a paint/sealant. Ultimately, with all the work involved with painting the sink (and possibly maintaining the paint in the future if it gets cracked, etc.), it might just be better (and cheaper) to replace the sink with a different material. Good luck!
Source: HowStuffWorks – What makes the quartz countertop so special?
Source: Hunker – Painting on Quartz
I have the same problem cleaning my quartz sink; not only are there stains but actual gauges and even though we never used harsh cleansers and scouring pads, at first it got scratched way too easy and stained that using scouring products are the only way to half-way clean the the discoloration, however the counters are still beautiful. We have tried everything. The solution is a top mounting stainless, which is my immediate future. Very disappointed with my sink; it looks terrible. Bar Keepers Friend made no difference.