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AC Pressure

  • Posts: 138
Black spots
« on: April 25, 2012, 03:19:25 pm »
I cleaned a rear patio this morning it had not been cleaned for 8 years so was very dirty after cleaning it looked better but not great, black litchen spots and still looks dirty although it is a hell of a lot better than it was.
I am not happy with it are there any safe bio degradable chemicals on the market that will get rid of these marks as customer does not want chemicals used that will kill flowers or lawn.
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Kev Martin

  • Posts: 6954
Re: Black spots
« Reply #1 on: April 25, 2012, 04:15:55 pm »
What is the Patio made of?

Kev Martin
Marble Life 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

AC Pressure

  • Posts: 138
Re: Black spots
« Reply #2 on: April 25, 2012, 07:19:20 pm »
The patio is riven buff coloured slabs
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Blast Away

Re: Black spots
« Reply #3 on: April 25, 2012, 07:30:09 pm »
Aqua Mix Extreme...
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Kev Martin

  • Posts: 6954
Re: Black spots
« Reply #4 on: April 25, 2012, 07:37:10 pm »
OK

I am not sure what you did this morning but it is very important to note that before you start you need to pre wet the stone as it is probably porous therefore anything you use on it will sink straight in and therefore you are vitually wasting your time.  If you mask off the grass and plants and then follow the steps below I am confident it will clean:

1.  Mask off any plants and or lawns.
2.  Pre wet the stone
3.  Fill your rotary scrubber tank with diluted pH14 High Alkaline cleaner such as Aqua seal Xtreme or Aqua Mix Heavy Duty Tile & Grout Cleaner.
4.  Scrub with a soft to medium brush and allow to dwell, then scrub again.
5.  Rinse and vacuum then rinse again.
6.  If all is well carry on with the process.
7.  If not repeat the process but this time add a little Aqua Seal Hone 320 Grit powder and work in.
8.  Now repeat step 5.

It should be then sorted.  If not give me a call on 0121 705 5333.

Kev Martin
Marble Life 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

Rob_Mac

Re: Black spots
« Reply #5 on: April 25, 2012, 07:38:21 pm »
What are the litres per minute & PSI of your machine. A 15LPM should be clearing most surface build up.

Are you using a flat surface cleaner then rinsing down with lance?

Are you lancing with turbo nozzle, flat nozzle?

Are you getting close enough?

I can honestly say I only ever use chemicals on graffiti and that is become less often with the heat of the H & M.

Rob ;D
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Kev Martin

  • Posts: 6954
Re: Black spots
« Reply #6 on: April 25, 2012, 07:40:14 pm »
Quote from: Blast Away on April 25, 2012, 07:30:09 pm
Aqua Mix Extreme...

 ;D ;D ;D ;D ;D  Close Aqua Seal Xtreme!  Aqua mix Extreme is for Soot, rust and fire damage and is a buffered acid

Kev
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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

AC Pressure

  • Posts: 138
Re: Black spots
« Reply #7 on: April 25, 2012, 07:52:53 pm »
Quote from: M-CLEAN UK LTD on April 25, 2012, 07:38:21 pm
What are the litres per minute & PSI of your machine. A 15LPM should be clearing most surface build up.

Are you using a flat surface cleaner then rinsing down with lance?

Are you lancing with turbo nozzle, flat nozzle?

Are you getting close enough?

I can honestly say I only ever use chemicals on graffiti and that is become less often with the heat of the H & M.

Rob ;D

I also never use chemicals but this one is the worst that i have ever come across my machine is the PT250e from Tech Clean 15 Lpm 250 bar 3600psi. Cleaned with lance and turbo nozzle dont get me wrong it looks a hell of a lot better than it was but i am just not happy with the fact that there are spots left on it.

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Rob_Mac

Re: Black spots
« Reply #8 on: April 25, 2012, 07:57:03 pm »
Lots of overhanging vegetation & tree cover, damp?

Good bit of kit! ;)

Rob ;D
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mike roberts

Re: Black spots
« Reply #9 on: April 25, 2012, 08:20:06 pm »
sheet up, hypo vac recovery
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AC Pressure

  • Posts: 138
Re: Black spots
« Reply #10 on: April 25, 2012, 09:40:06 pm »
Just had call from customer he is over the moon with how it has cleaned up said he never expected it to come so clean. If he is happy then so am i  :)
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Blast Away

Re: Black spots
« Reply #11 on: April 26, 2012, 05:27:07 pm »
Quote from: Kevin Martin on April 25, 2012, 07:40:14 pm
Quote from: Blast Away on April 25, 2012, 07:30:09 pm
Aqua Mix Extreme...

 ;D ;D ;D ;D ;D  Close Aqua Seal Xtreme!  Aqua mix Extreme is for Soot, rust and fire damage and is a buffered acid

Kev

 ;)

Quote from: M-CLEAN UK LTD on April 25, 2012, 07:38:21 pm
What are the litres per minute & PSI of your machine. A 15LPM should be clearing most surface build up.

Are you using a flat surface cleaner then rinsing down with lance?

Are you lancing with turbo nozzle, flat nozzle?

Are you getting close enough?

I can honestly say I only ever use chemicals on graffiti and that is become less often with the heat of the H & M.

Rob ;D

Rob, you won't remove black spots with just water pressure. Have you used hypo? I go through 5 drums a week.
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mike roberts

Re: Black spots
« Reply #12 on: April 26, 2012, 05:51:31 pm »
hence the name 'Hypo Man'  ;D ;D
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Rob_Mac

Re: Black spots
« Reply #13 on: April 26, 2012, 07:29:47 pm »
I can and I do! ;)

We have black spot all over kerb edges regularly. They are there and then they are gone

Rob ;D
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Blast Away

Re: Black spots
« Reply #14 on: April 26, 2012, 07:35:58 pm »
Quote from: mike roberts on April 26, 2012, 05:51:31 pm
hence the name 'Hypo Man'  ;D ;D

Thought it was King?  ;)

Quote from: M-CLEAN UK LTD on April 26, 2012, 07:29:47 pm
I can and I do! ;)

We have black spot all over kerb edges regularly. They are there and then they are gone

Rob ;D

Rubbish! I'd like to see you tackle indian stone with just your H&M. You've got no chance with just water, cold or hot.
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Rob_Mac

Re: Black spots
« Reply #15 on: April 26, 2012, 07:44:43 pm »
I have only cleaned one 5000sqm of Indian Sandstone in the last six years, 18 months old, no blackspot on it.

You will note that Sainsbury's and the other larger supermarkets don't go a whole heap on Indian Sandstone.

So I will reiterate in my circumstances, on the surfaces I have cleaned I have removed all blackspot from them ;)

Rob ;D
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AC Pressure

  • Posts: 138
Re: Black spots
« Reply #16 on: April 26, 2012, 10:28:50 pm »
I have to say that i have never used chemicals and black spot has always been removed with just the turbo and cold water. However this one has proved that some jobs will require chemicals to get the job done. Where can i buy Hypo  :)
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BDCS

  • Posts: 4777
Re: Black spots
« Reply #17 on: April 26, 2012, 11:07:17 pm »
Do you really have a problem with black spots in Birmingham ?
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Matt Gibson

  • Posts: 2482
Re: Black spots
« Reply #18 on: April 27, 2012, 07:37:19 am »
I had to take antibiotics to get rid of my black spots   :'( ;D
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AC Pressure

  • Posts: 138
Re: Black spots
« Reply #19 on: April 27, 2012, 11:58:51 am »
Quote from: BDCS on April 26, 2012, 11:07:17 pm
Do you really have a problem with black spots in Birmingham ?


Excuse me i live in Solihull not Birmingham  ;D  ;D
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