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Roof Cleaning New Jersey wrote:

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Every once in a blue I run into vinyl windows that turn a rustic color from SH.  Even happens with house wash mix which is far weaker than roof mix.  I can fade it out a bit with Gutter Grenade but not 100%.  I dont know what causes this or how to detect which vinyl windows it will happen to.

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Ed Just leave the window alone it is a chemical reaction once the sun hits it it will turn bright white again I promise you, but like I said the sun has to hit it, it wont work on a cloudy day.

 

I haven't had that happen on vinyl windows yet. I did have gutters today I cleaned with gutter grenade turn rusty but it rinsed off. I was wondering what caused that, maybe something in the gutter?

I've had the same problem. I once did a double wide house.....I always prewet the wall......I x jet the whole wall. Turn around and every window is orange. But same as you, it only happens once in a blue moon. Not sure what causes it, but the remedy I use is prewet, soap and rinse windows immediately. But if it's too late, dip the brush into some castrol super clean (amazing stuff) from walmart and good to go. I too, would like to know what the cause of it is.

Good feedback guys. Glad its not only me.