[COLOR=black][FONT=Verdana]I know this has been addressed on this forum before, but I have quite a large job that I am doing a proposal for and just want to make sure that my info is accurate in the proposal.[/FONT][/COLOR]
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[COLOR=black][FONT=Verdana]On the lower level of some of the panes, there is a buildup or scaling. There aren’t any sprinklers around. It seems the only way to remove this is with some sort of acid. What is the best product to use?[/FONT][/COLOR]
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[COLOR=black][FONT=Verdana]The whole reason I was asked to give an estimate was because there was a large supermarket around the corner being built and massive amount of concrete overspray was hitting this facility, which is a car dealership with three 3-story buildings. The overspray destroyed 300 cars and really dirtied the windows. It doesn’t seem that any damage was done to the windows from the concrete overspray. The scaling seems to have been there before that. [/FONT][/COLOR]
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[COLOR=black][FONT=Verdana]Anyone have experience with a situation like this?[/FONT][/COLOR]
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[COLOR=black][FONT=Verdana]In the pics below, I had wiped with my fingers the dust away near the scaling. Again, there is only scaling on maybe 10 panes out of 200.[/FONT][/COLOR]
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I think you actually may be dealing w/ concrete overspray. I had a customer that lived behind a temporary concrete batch plant. The over spray looked very much like what you are dealing w/ here. That means the deposits are probably calcium and magnesium. Whichever chemical you use make sure it will dissolve those minerals. Here’s a link for something that might work www.prestorestorationproducts.com
Thanks Tony. It looks like Presto’s “Glass-Crete” might do the job.
I had let the dealership know that I would try a “specialty” cleaning chemical (I would of course test it out in a small inconspicuous spot first) and that if it didn’t work, they would have to seek professional restoration or replacement. That was exactly what they wanted to hear because they are currently in a lawsuit with the large supermarket chain.
We’ll see what happens.
Hey Tony,
We as window cleaners use [I]scratch waivers[/I]. Are there any specific waivers that should be used for glass restoration or use of these restorative chemicals?
You may want to make one up for your purposes. Under normal use the chemicals designed for restoration won’t harm IG seals. That being said check all the cautions on the product label and wear appropriate PPG (personal protective gear). Some guys have used oven cleaner to remove hard water stains and it can damage the IG seals if left on too long. The same could apply to chemicals like CC550. I’d get a waiver signed that says you are not responsible for failure of IG seals. Remember the windows are damaged and you are offering an option to replacement due to negligence of another party.
