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C2damofoj

Big EIFS job

Question

We are doing a good sized EIFS cleaning on a 2 story building, total area to be cleaned is roughly 40,000 sf. I performed a test on one of the dirtiest spots on the building, results were not as good as I expected. I sprayed on 50/50 water/SH with a little dawn from a pump up sprayer, it completely got rid of any mold or mildew bit there are still black streaks as you can see in the pic. I repeated the process again with straight SH to see if the black streaks would lighten, but they remained. I just used garden hose pressure to rinse. I will be using a sureflo to apply the chems. Anyone have any ideas as to what would get these off? post-10130-137772463344_thumb.jpg

post-10130-137772463175_thumb.jpg

post-10130-137772463263_thumb.jpg

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The pictures come out to zoomed in that I can't really see them. But like Joel asked, were you able to find an answer. I have these on buildings in my area and even I don't know how to get rid of them. I don't really do building washing yet, but this would be a great piece of information to myself.

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Kristopher/Joel,

 

Something like this may take a restoration chemical to clean. There are a few different manufactures for this, Prosoco, EacoChem, Dietrich (sp). EacoChem has sample test kits you can buy and do testing with. There OneRestore is good chemical to have in your arsenal.

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Kristopher/Joel,

 

Something like this may take a restoration chemical to clean. There are a few different manufactures for this, Prosoco, EacoChem, Dietrich (sp). EacoChem has sample test kits you can buy and do testing with. There OneRestore is good chemical to have in your arsenal.

 

I have OneRestore in my trailer now, but I use that on windows only and do it through a pump up sprayer. Would X-jetting a dilution of OneRestore to the building work? And then what about adding a bit one OneRestore to a house wash mix and X-jetting that on the building? If you or anyone else hasn't tried this method and if I wanted to test it out what precautions would I need to take before doing this?

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OneRestore is Hydrochloric based, I would not mix with a house wash mix, but then I am not a chemist. It is made to be applied full strength, but I have a building wash coming up next month that I am thinking about diluting. X-jet I would not do because applying low pressure should give better coverage. At over $1000 for a 55 drum, I am not wasting product.

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I've heard of window washers diluting it 50/50 or less when using it for hard water stain on windows. I have always used full strength when doing windows, just never tried OneResore on these sorts of stains before. Maybe next time I have the chance to test it, I will. I'll try the pump up sprayer 1st before x-jetting it. 

 

Yeah, I wasn't too sure about adding it to the house wash mix or not either. If I do X-jet it as a test I'll probably do it as dilution 50/50 and see what happens if the pump up test goes well first.

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I finally got this job locked down for next spring!  OneRestore worked the best for the oxidation stains, I also tried everything that could possibly work from Prosoco.  We are going to apply a strong house wash to whole building, then come back and work on the oxidation stains, then seal the entire surface with siloxane.  We will apply a strippable masking to all windows prior to spraying the siloxane, should be fun to peel off after the job is complete.

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