Removing limesale from a concrete kitchen top

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My London water is alkaline and limesale sediments have accumulated on my concrete kitchen top. How can I remove it without damaging the concrete? The pic shows the worst affected area.

20260808_142505.jpg
 
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Resin worktops go white like that with solvent..
I accidentally put a paint brush down on a resin worktop that I just cleaned with white spirit and it went white.

You think that's marble or other? You can tell as stone is cold to the touch.

If that is lime then try a lime scale remover but I'm not sure it is?
 
Resin worktops go white like that with solvent..
I accidentally put a paint brush down on a resin worktop that I just cleaned with white spirit and it went white.

You think that's marble or other? You can tell as stone is cold to the touch.

If that is lime then try a lime scale remover but I'm not sure it is?
The worktop is made of concrete. The white marking on the worktop is limescale.
 
Lay a cloth or kitchen towel over the patch and soak with white vinegar and lemon juice overnight . Repeat if necessary..
 
Lay a cloth or kitchen towel over the patch and soak with white vinegar and lemon juice overnight . Repeat if necessary..
Unfortunately, applying any acid to the concrete will leave a permanent stain. This is one of the downsides of a concrete worktop.
 
Unfortunately, applying any acid to the concrete will leave a permanent stain. This is one of the downsides of a concrete worktop.
So is it sealed ?

  • Bicarbonate paste: Mix baking soda with a tiny amount of water to create a thick paste, smooth it over the crust, and let it sit for 10 minutes.Gently rub the paste in circular motions using a soft-bristled toothbrush or a non-scratch nylon pad to lift the minerals. Wipe the area completely clean with a damp microfiber cloth and immediately dry it with a towel to prevent new spots.
 
So is it sealed ?

  • Bicarbonate paste: Mix baking soda with a tiny amount of water to create a thick paste, smooth it over the crust, and let it sit for 10 minutes.Gently rub the paste in circular motions using a soft-bristled toothbrush or a non-scratch nylon pad to lift the minerals. Wipe the area completely clean with a damp microfiber cloth and immediately dry it with a towel to prevent new spots.
Hi. Yes it is sealed, or at least it was 10 years ago when it was installed.
 
Explains the damage ,Concrete worktop maintenance requires daily gentle cleaning with mild soap and warm water, avoiding acidic or abrasive cleaners, wiping spills immediately, using chopping boards and coasters, and reapplying a protective wax or sealer coat every month or as specified by the maker
 
Explains the damage ,Concrete worktop maintenance requires daily gentle cleaning with mild soap and warm water, avoiding acidic or abrasive cleaners, wiping spills immediately, using chopping boards and coasters, and reapplying a protective wax or sealer coat every month or as specified by the maker
The water stains mostly on my washing up drying board as seen in the pic are largely due to me not following the care regime you mention although I do use chopping boards and make sure nothing acidic touched the concrete.
 
The advice I received from the manufacturer of my concrete worktop might be of use to theirs so I'll post it here.

The advice is to wet-polish the concrete countertop using a grinder with diamond polishing pads. Then seel with a concrete sealer.

I'll post results once I've given it a go.
 
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Best of luck.

Did they say if you can touch in the sealer after spot sanding? With some types of sealant you will get a halo effect at the edges. If it is a wax type product you might be ok.

I have never worked on a concrete worktop but my current customer has a polished concrete floor. It looks great... bar the very tiny crack in one of the panels. I didn't point it out to the customer, but she has probably noticed. One the upside, like polished plaster, it can be touched in.
 
Best of luck.

Did they say if you can touch in the sealer after spot sanding? With some types of sealant you will get a halo effect at the edges. If it is a wax type product you might be ok.

I have never worked on a concrete worktop but my current customer has a polished concrete floor. It looks great... bar the very tiny crack in one of the panels. I didn't point it out to the customer, but she has probably noticed. One the upside, like polished plaster, it can be touched in.
They didn't. I'm going to polish and seel the whole countertop and kitchen island.

I'll ask about the sealer. I think they use water base sealer but not sure.
 
They didn't. I'm going to polish and seel the whole countertop and kitchen island.

I'll ask about the sealer. I think they use water base sealer but not sure.

Fair play.

Please let us know how you get on.

Are they recommending that you use a regular angle grinder? I have previously considered buying a polisher but couldn't justify the >£500 cost for a product that I might use once every three years.
 
Fair play.

Please let us know how you get on.

Are they recommending that you use a regular angle grinder? I have previously considered buying a polisher but couldn't justify the >£500 cost for a product that I might use once every three years.
I double-checked and the recommendation is in fact to use an orbital sander with diamond polishing pads. Although I've seen videos recomending polishing with a grinder with diamond polishing pad, my concrete countertop guy says a grinder goes too fast and will throw too much water around. Orbital sander is okay apart when polishing the kitchen island where I've got a hob that's proud of the concrete countertop. I've yet to resolve that but I'll update upon clarification.

I had a look for polishers and found this one.
It looks good and doesn't cost an arm and a leg.
 

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