Asked on Dec 07, 2014

Hard water stains in granite sink

by See772920
Any ideas on removing these horrible water stains from my granite sink? I tried vinegar, didn't touch it! Please help
  27 answers
  • Dee Dee on Dec 07, 2014
    I have a black granite sink and it used to drive me nuts. Clean it really well with bar keepers friend. Rinse, rinse and rinse again. Then use some vinegar and water and rinse again. Go to the grocery store and get mineral oil. It is usually with the "upset stomach" stuff. It cost around $1.50 and since it is for human consumption it will not hurt you. The stuff they sell in HD and Lowes is not for human consumption. Reb a generous amount about a tablespoon into the sink. Let it dry and if there is excess you can wipe it off. I do not wipe it off any longer because the oil protects the sink as you use it. I do this once a month or when needed. Takes about 10 minutes to complete.
    • See 3 previous
    • Sam Sam on Apr 09, 2020

      Barkeepers friend and vinegar are actually acidic, meaning they can eat through the surface layer of your granite. This is called "etching."

      Instead, you'll want to do the following:

      1. Avoid using lemon, vinegar, CLRS, Barkeepers Friend, etc. These products are not designed to be safe on granite, and can actually damage it, causing a white haze called "etching."
      2. You'll need to do one of two solutions, depending on the underlying issue. If the issue is mineral deposits or hard water, you'll need to find a product formulated for hard water and mineral deposits for granite sinks. These are hard to come across, and from what I'm aware of, I believe the only real product for this is the Supreme Surface Composite Granite Sink Cleaner & Maintenance Kit. It's just two products and is simple to use.
      3. If you have previously used vinegar, lemon, CLRS, bar keepers friend: this means your surface is most likely etched. In this circumstance, the surface typically looks better when its been recently wetted or oiled. However, oils and waxes will not solve this issue, they will only temporarily hide it. You'll want to seek professional advice for this. Many individuals will recommend seeking your local fabricator/installer, but I recommend just calling the Supreme Surface Customer Support team. I had a similar issue to this in the past, and within just a couple of days they helped me to have everything sorted out. It was a multi-step process, so I'd really recommend calling them in this case.
  • Jillian Seymour Jillian Seymour on Dec 08, 2014 Here is a link on things to try on toilets. Use the steps and try with a dry sink.
  • Wanda.ll Wanda.ll on Dec 08, 2014
    Here is where to go to look for something safe to clean this with. If you can't find in this part ,then call his place and they can tell you. He goes to all the home shows and finds only the best to use. Ladies you need to save this man's webpage. He is the greatest at what he does and has been doing for over 40 years I think.He won't steer you wrong and get you into trouble,( making mistakes and ruining you stuff).No I don't get anything for telling you about him I just us him and his stuff all the time. Speed dial almost.
  • Debbie Snyder Debbie Snyder on Dec 08, 2014
    I've always used bar keepers friend. Wet a paper towel or sponge lightly, then sprinkle BIG on.With wet fingers rub into sponge or towel making a paste. Clean with the grain of there is one, otherwise just small round circular motion. Rinse with cool water and paper towel, then buff dry. How this helps!
    • Sam Sam on Apr 09, 2020

      Hi Debbie, be careful using Barkeeper's friend products on your sink, since a majority of them are abrasive and not safe for composite granite sinks, or other natural stone surfaces.

  • Kirsten Veneziano Kirsten Veneziano on Dec 08, 2014
    Borax is my go to in the shower with soap scum and hard water if the vinegar isn't working.
  • Millicent Millicent on Dec 08, 2014
    If Dee's advice doesn't help, I'm with Wanda. Johnnie Chuoke is the best.
  • Rebecca Rebecca on Dec 08, 2014
    The most important maintenance to do after you get the sink clean is to wipe it dry EACH time after you use it. A quick swipe of a towel will save you!
  • Sue Sue on Dec 08, 2014
    Will it clean the build up on a shower door?
  • TexasTea TexasTea on Dec 08, 2014
    Try the mineral oil first, I don't think you are supposed to use an abrasive like Barkeepers on that surface. I have a Blanco Silgranite sink, to prevent this rinse the sink with hot water after EACH use then dry with a soft towel. Occasionally rub with mineral oil.
  • Dee Dee on Dec 08, 2014
    Do not use any of the methods to clean a toilet, you will ruin your sink. I got the info about using the mineral oil from a contractor. The reason you use the mineral oil from the grocery store for stomach upsets is that it is consumable and will not poison you. If you do not want to use barkeepers friend, use the orange hand cleaner stuff. Make sure you rinse well then rinse again....then apply the mineral oil. Baby oil does not work as well and you will be oiling your sink every few days with the baby oil. A black granite sink is very different than cleaning a white or stainless sink. The mineral oil will work, I have been using it for 2 years and still on my first 16 oz bottle.
    • See 1 previous
    • Dee Dee on Dec 09, 2014
      @Meredith Black Dawn is good, but if not rinsed well adds to the film. I live in a very hard water area, so I know the difficulties of hard water. If you need just the extra boost, use the orange glo hand cleaner that mechanics use to get grime off or a mixture of that with baking soda. Sometimes you need to scrub some of the stains off. I think the mineral oil is thicker and lasts longer. Just remember to get the stuff at the pharmacy not big box stores.
  • Czosel Czosel on Dec 08, 2014
    I was told by the guy who installed my blanco sink to spray it down with a little WD-40 and shine it up that way. Works really well and makes my stains disappear. Mineral oil probably does exactly the same...probably smells a little better too.
  • Sherrie S Sherrie S on Dec 08, 2014
    I'm having my kitchen redone with a blanco granite sink. I'm glad I read this before I had any problems. I'm going to discuss it with the installers. Thank you for posting.
  • Joy  Johnson Joy Johnson on Dec 08, 2014
    I have a black granite sink that is impossible to clean. I got the best results with a granite cleaner, but always have a white film on it!
  • Wglindner Wglindner on Dec 08, 2014
    I have bad hard water I had to get this water software installed in my home. My water tank had clumps of hard water.on the elements they took out. Just put gloves on and a rag pour clr on it and wash it down . Then I had a friend that told me to use car wax even on my shower door. But after I put the soft water system in it stop. But car wax I love putting on my shower doors because the water just run's straight down. Clr will clean your coffee pot also just pour it into the glass pot and leave for a few minutes and it gone .
    • Rachel Garcia Rachel Garcia on Feb 26, 2021

      Hi, we are remodeling our kitchen we have hard water and wanted the blanco silgranite sink in black. My husband is looking into putting soft water system in did that help with the white rings? With this color sink do you have to wipe dry after every use?

  • Patti Fraser Griswold Patti Fraser Griswold on Dec 08, 2014
    I use just plain old olive oil about once a week on my black granite composite sink.
  • LaVerris Steadham LaVerris Steadham on Dec 08, 2014
    I use baking soda, add a little water to make a paste. Let it sit for a while.
  • Gladys Rhoads Gladys Rhoads on Dec 08, 2014
    sprinkle baking soda over the stains lightly then spray with vinegar and it will boil it loose, may take more than one treatment whip clean with cloth or paper towels between treatment.
  • Cheri P. Cheri P. on Dec 09, 2014
    After search the internet for solutions, we were able to completely remove the white deposits in our black granite sink using Mr. Clean Magic Eraser - Original. Be careful NOT to use it on the drain hardware, and to read the warning on the back before using it, because it is somewhat abrasive. The warning on the box says: Test a small area with light pressure before use. NOT recommended for the following surfaces: high gloss, polished, dark, brushed, satin, faux, bare/polished wood, copper, stainless steel, non-stick coating, or vehicle body. Rinse required for surfaces in direct contact with food. DO NOT USE with chlorine bleach or other household cleansers.
  • Simply Real Moms Simply Real Moms on Dec 09, 2014
    This works for hard water on glass, but I'm not sure it would work in your situation:
  • Barbara Purtlebaugh Barbara Purtlebaugh on Dec 09, 2014
    try some lime away than polish up with real mayonnaise
  • See772920 See772920 on Dec 10, 2014
    Thanks everyone for your advice, I tried most of them, nothing REALLY got rid of the stains but the oil does cover it up! So I will continue to use oil on it once a week it looks brand new!
  • Meredith Black Meredith Black on Dec 10, 2014
    Thanks Dee
  • Clint Clint on Jun 27, 2017

    I found white vinegar helps. Just soak a rag in white vinegar and then let it sit. Use a little elbow grease as well. Once you're happy use any type of cooking oil to bring back the luster of the black

  • Donna Donna on Dec 01, 2017

    I have a brown Blanco sink and have noticed stains from cups and splashes. Have tied suggested remedied for black sinks but still have stains. Any suggestions?

  • Stacy Wagner Stacy Wagner on Sep 04, 2019

    I am a professional cleaner and have chosen the product I use because it lasts the wntire time between client cleanings. Oil works for a short period of time, but for results that last longer and create a barrier for future issues, use Boos Block Board Cream. Plus it is safe for food prep. Apply a generous amount to a clean, dry sink and it will give you a new looking finish for much longer than any oil. Hope this helps!


  • Hannah Hannah on Dec 02, 2020

    Hi there! I'm looking for an image of limescale in a black sink to feature in a TV programme. If you wouldn't mind emailing me on I can send you some more information. Thank you!