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*Derek*

  • Posts: 184
Cleaning Limestone flags
« on: July 20, 2014, 11:47:24 am »
Can i get an opinion on this.

Surface has been powerwashed not by us. Poor results.

I was thinking of using either Hypo or high alkaline cleaner, Aggitation and either vac or powerwash off.


Any other suggestions for me?
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*Derek*

  • Posts: 184
Re: Cleaning Limestone flags
« Reply #1 on: July 20, 2014, 12:24:42 pm »
more pictures
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chris scott

  • Posts: 3414
Re: Cleaning Limestone flags
« Reply #2 on: July 20, 2014, 03:59:32 pm »
Looks like very badly laid sandstone not limestone . With (hard to tell from pictures but possible) residual sealer and black spot. Image 1
Leave it alone...unless the customer likes to pay.
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www.cleaning-service.uk.com
www.render-cleaning.co
https://www.cleaning-service.uk.com/bromoco-systems/
Exterior cleaning specialists covering Merseyside,Lancashire and Cheshire. TEL 08000 933267

BDCS

  • Posts: 4777
Re: Cleaning Limestone flags
« Reply #3 on: July 20, 2014, 05:41:57 pm »
Looks like they have had brick acid on it - I too agree there are easier ways of earning a crust  ;D I would wet blast a section to see what happens and go from there
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drive surgeon

  • Posts: 2812
Re: Cleaning Limestone flags
« Reply #4 on: July 20, 2014, 08:57:17 pm »
Isn't that York stone. It's not limestone
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Kev Martin

  • Posts: 6954
Re: Cleaning Limestone flags
« Reply #5 on: July 21, 2014, 05:33:22 pm »
Clean it as follows

Pre wet
Apply high alkaline scrub in with a manual rotary scrubber
Apply honing powder and scrub so the surface ends up with an overall even appearance
Then rinse
wet vac
rinse and vac again
then seal

Kev Martin
Tiling Logistics Ltd
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"Natural Stone Restoration Specialists" Tel: 0121 773 9129
www.tilinglogistics.co.uk | www.marblelife.co.uk  http://stores.ebay.co.uk/Tiling-Logistics

chris scott

  • Posts: 3414
Re: Cleaning Limestone flags
« Reply #6 on: July 21, 2014, 07:58:30 pm »
Quote from: Kevin Martin on July 21, 2014, 05:33:22 pm
Clean it as follows

Pre wet
Apply high alkaline scrub in with a manual rotary scrubber
Apply honing powder and scrub so the surface ends up with an overall even appearance
Then rinse
wet vac
rinse and vac again
then seal

Kev Martin
Tiling Logistics Ltd
Did you get the gay clay?
Logged
www.cleaning-service.uk.com
www.render-cleaning.co
https://www.cleaning-service.uk.com/bromoco-systems/
Exterior cleaning specialists covering Merseyside,Lancashire and Cheshire. TEL 08000 933267

Kenny83

  • Posts: 1131
Re: Cleaning Limestone flags
« Reply #7 on: July 21, 2014, 10:16:47 pm »
Looks like it's been layed on concrete just spotted around to hold the slabs in place, as opposed to being layed on a full solid bed, this is usually what the after effects are
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Pressure Washing -
www.powerwashcleaning.co.uk

*Derek*

  • Posts: 184
Re: Cleaning Limestone flags
« Reply #8 on: July 21, 2014, 11:24:35 pm »
More feedback.

I did a test area with high alkaline solution and test patch came out well but not all black spots came off. I don't think surface was sealed before.

The previous company who cleaned it damaged all the grout. It was perfect before that and never got black spots either.

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Kev Martin

  • Posts: 6954
Re: Cleaning Limestone flags
« Reply #9 on: July 22, 2014, 06:20:27 am »
Add honing  powder

Kev Martin
Tiling Logistics Ltd
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"Natural Stone Restoration Specialists" Tel: 0121 773 9129
www.tilinglogistics.co.uk | www.marblelife.co.uk  http://stores.ebay.co.uk/Tiling-Logistics

chris scott

  • Posts: 3414
Re: Cleaning Limestone flags
« Reply #10 on: July 22, 2014, 10:03:45 pm »
Quote from: *Derek* on July 21, 2014, 11:24:35 pm
More feedback.

I did a test area with high alkaline solution and test patch came out well but not all black spots came off. I don't think surface was sealed before.

The previous company who cleaned it damaged all the grout. It was perfect before that and never got black spots either.


Be careful ...I think the customer is telling you porkies. The pointing looks like it has failed "naturally" and most (not maintained) sandstone has lichen growing on it.
Logged
www.cleaning-service.uk.com
www.render-cleaning.co
https://www.cleaning-service.uk.com/bromoco-systems/
Exterior cleaning specialists covering Merseyside,Lancashire and Cheshire. TEL 08000 933267

*Derek*

  • Posts: 184
Re: Cleaning Limestone flags
« Reply #11 on: July 22, 2014, 10:09:14 pm »
You might be right Chris!

Thanks Kevin, We'll give it a go!
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Roger Oakley

Re: Cleaning Limestone flags
« Reply #12 on: July 23, 2014, 12:07:14 pm »
Badly laid & badly maintained Sandstone, Charge accordingly to clean & seal this.
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