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Danny, I have extensive experience in both; stain removal and glass restoration. If you can, describe what is on the glass....a photo would be helpful too as wellas your experience is glass cleaning.

Stains range from simpe hard-water spots to cement run-off and from easy to impossible.
 

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Clearly,

I have been cleaning windows for quite a while now and have run into some deposits on windows that do not respond to acid cleaning like water stains or mineral deposits will. These stains normally appear on older glass and are reddish with a kind of rainbow haze. I have tried the acid wash, razoring vigorously, and fine steel wool. Any other suggestions?

Thanks,
 

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From the description, I am baffled. I feel certain I could help if you provide a phot. Until then, check to see if any sprinklers are near by....the "rainbow" haze you speak of indicates iron oxide...easily removed with the right acid.

Also, are these commercial or residential windows?
 

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Here are two shots of what may be your condition and the results of proper restoration:








 
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