Stains on windows at a carwash

Got a question for thw window guys
Have you ever run into stains like this and if so what os the best way to remove them safely
Havnt touched them yet and just wanted some feed back before i give em a go

It looks like when the area AROUND the windows gets wet, it runs and stains the glass. Could be some kind of hard mineral or something that chills there til it gets wet. Then wants to run down from the window frame…

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Looks oily. Look closely and u can see its coming from the roof(?).

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Agreed. Something on the framing is the general consensus. Another guy recommended a certain stain remover and ill give it a go and see what happens. Aprreciate the feedback

Is that a conex box?

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It is

That looks like coated glass, be real careful what you use on it, could make that situation even worse. Whatever you use, do a small test spot first. Looks like a chemical burn, if it’s just hard water buildup, you should feel that on the glass itself. If it’s smooth it may be permanent damage, ive seen both over the years.

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It’s run off from something!

The only time I have ever seen a stain on a window like this, is on those smooth cement exterior homes… the rain will run down the cement wall and bring down all the minerals and crap down the window causing a stain over time…

Having A WC backround that looks like it’s been there a while…

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