What kind of stain is this?

Came across this stain while giving a quote. Doesn’t look like hard water. Does anyone know what this is, is it even cleanable lol

is it on the inside, outside or in between the panes?
did you try anything?

That’s in between the panes.

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what kind of moron is up at this time on saturday morning posting on a forum…wait…

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Morons off to work. New big job this weekend. You’re clouding my thinking of how I’m going to go about it. Hehe

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…Yep…Looks like it…

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it was outside, i scratched it with nails it coming off… sort of. Felt like something was baked on

I think it’s a low e window or something installed wrong

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