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Old 30-06-2018, 06:09 PM   #1
TonyHill
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Cement splatters!

Ok, so I've been asked by a regular client if I fancy cleaning 30-40 cars that have their roofs, bonnets, bootlids etc...splattered with cement from a high rise building site right nextdoor to their car park.
All the cars look like this, and worse! Is there a product to help with the removal? My local Autosmart guy recommended Congo, does anyone have any experience with this?? Thanks _20180630_170829.jpg
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Old 30-06-2018, 06:36 PM   #2
GP Punto
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Firstly, best of luck, I had this problem with my sisters Mercedes, rain leaked through a concrete roof of the car park in the newly built apartment block where she lives and caused a real mess on the bonnet, tried regular washing and a power wash, I couldnt fix it and told the developers it was their problem, they had the car resprayed. The concrete seemed to be bonded to the paint.

Will be following this thread.

Edit. Perhaps agree to one and have a hold harmless agreement between you and the employer.

Last edited by GP Punto; 30-06-2018 at 06:39 PM.
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Old 30-06-2018, 06:40 PM   #3
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Resprays seems to be the general consensus of opinion.
They are literally baked on solid in this heat.
The construction company have apparently agreed to cover external valeting costs, but I think they're going to be in for a nasty surprise! Some of the cars are real high end motors
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Old 30-06-2018, 06:52 PM   #4
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I tried and tried, especially with it being a member of the family.

Appreciate that its not your worry but if the construction company (more likely its insurers) agree to external valeting and that isnt successful, paying that bill, and then someone coming along for respray costs. Sounds like a real problem for the solicitors
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Old 30-06-2018, 06:58 PM   #5
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Hi Tony- perhaps suggest your client and the builder agree to using Congo on two or three cars as a test sample? That way the insurance company can't argue that resprays are an excessive/unnecessary solution

Last edited by suds; 30-06-2018 at 07:01 PM.
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Old 30-06-2018, 07:10 PM   #6
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Don't want to sound defeatist but you may be fighting a losing battle.

I've had it before where I picked up fresh cement that had ran into the road from a neighbours extension, splattered the inner archs and low cills.

I've blasted it from an inch away and it didn't shift. On some spots I had to wet sand them down to remove them.
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Old 30-06-2018, 08:16 PM   #7
TonyHill
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I do think it may be a losing battle, and possibly trying Congo on a test car could be a possibility.
One thing I noted on a video regarding this product, was that it stated for best results it should be sprayed on then left 24hrs before pressure washing.....
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Old 30-06-2018, 08:55 PM   #8
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Quote:
Originally Posted by TonyHill View Post
I do think it may be a losing battle, and possibly trying Congo on a test car could be a possibility.
One thing I noted on a video regarding this product, was that it stated for best results it should be sprayed on then left 24hrs before pressure washing.....

No personal experience of Congo but from the youtube vid it shows an application on builders plant, how the product might work on delicate paint is a question I would put to the seller before using, even on a test sample.
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Old 30-06-2018, 09:41 PM   #9
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Here is the video of Cogo in action.

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Old 01-07-2018, 12:07 AM   #10
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Concrete mixer lorries are washed down with diluted hydrochloric acid to remove concrete, it dissolves it away, then wash truck with loads of water. Don't get on plastic as it will go grey. Or you can get brick acid from builders merchants.
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