Anybody could tell me what I did wrong here?
At the time of washing they looked good, but since the weekend a large number have become stained/have an outline.
How can I get rid of these stains.
I used a SC at 4GPM
Those are some strange looking outlines. What chemicals did you use.
No Products, Just water!
I’m willing to bet those pavers were filthy, only once you cleaned it and it dried you see what’s really underneath the dirt. You will never see square water outlines. Almost looks like glue outlines
Did you make an attempt to clean them off or see what they are?
Nothing yet. Im wondering if I should repeat same procedure or use Products and brush it off.
You may have stripped off the thinner layer of sealant, leaving behind the thicker stuff in the deeper ‘valleys’. I’ve seen this here locally a few times but never attempted to clean them with high pressure.
What PSI were you using?
What type of paver material? Natural Stone, Ceramic Tile w/stone overlay, concrete paver stone, etc.
What is the base materials? Crushed rock, compacted soil and/or sand, concrete slab, or rubber mat.
Is there a weed or vapor barrier/liner?
Does the ground slope towards the point you took the picture?
Was the table, trellis/canopy, and other furniture removed when you did the cleaning? Was there any chance of any metal getting wet to allow oxidation to drain out?
My observations: The outer perimeter tiles look to be okay or at least any staining/marks are not visible from this camera angle. The pattern does seem similar to construction adhesive globs and lines. IF these tiles are laid over a concrete slab and were glued down, combined with a slope towards where the camera was positioned, there may have been a moisture trap/absorption issue. Sometimes you will see this in the form of efflorescence which is normally a white haze on top of concrete paver stones and can be treated with an efflo remover (acid wash).
The more I examine the photo, it appears more that these are tiles with an actual grout line. Can you confirm? If so, the owner is looking at an issue with either an adhesive or motar ( I think they call it the butter coat). This may not have been visually precieveable until after you did the cleaning. Did you by chance take any photos when you gave the bid or at anytime prior to you doing the work?
I’m also assuming its grout lines or moisture trapped that evaporated after washing.
I used a 4200 psi at 4GPM Here is a better picture.
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I agree with dc brock ,clear sealant was taken off and the black lines are where the grime was pushed under edges of remaining sealant ,perhaps,use jasco paint adhesive stripper to remove it or diamabrush black edges and put more sealant down
Thats too much pressure for residential work,next time do a test area with the psi
Is this blue stone or blue nosed shale?
I like @QuickNClean idea, a lot of those stones look like they have been glued down to a slab, but not all, and the lines aren’t quite consistent with what the average pro would do. Did you install this yourself?
If that is an after picture, what did it look like before? Have a before photo?
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Did you find a solution?
It was a mix of sealeant and grime. Thanks @Powerjet for the tip.
I think I used to much pressure and it spread the sealant which mixed with dirt and eventuelly dried in form of lines.
A rigid brissle brush to scrub was not enough. Paint remover did the job but it also took a layer of sealant off. Not ideal.
Anyways, problem is fixed.
Cheers
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