Hey handsome window cleaners:
Having been in business for 25 years, I have been faced with a little of everything to clean off of windows.
Oxidation is very common.
Did you know that glass is actually a pourous substance that absorbs certain elements?
In Texas, we have a lot of heat: hence the glass while it is hot will absorb freely the hard chemicals from water. Almost everyone that get's their windows cleaned has a sprinkling system.
The glass absorbs a lot more than is realized. Have you ever cleaned off that artificial snow after it has been on glass for a month with the sun on it every day?
I charge 4 times the normal charge to get it off. Mineral deposit stains:
The best treatment;
Vinegar straight mixed with some soap scum remover (limeaway, etc; they are all pretty much the same), and a bit of liquid dish detergent for spreading reasons.
Spray it on first; let it soak; scrape off what is left; wash really good;, squeegee, then wash again with regular formula: squeegee. That should get it.
Worst case; hydrochloric acid (heavilly diluted) be careful; same system.
Over here most of the new houses have windows that consist of 2 panes of glass pressed together to provide a bit of insulation.
The problem is that because of the elements( especially the hot sun), the seal breaks around the edge of the glass, and condensation forms in between the panes, and the windows cloud up.
Unfortunately, the only remedy is replacement. My own home that is only 5 years old, has had 5 windows replaced.
It is a problem when window warranties are only 1-5 years.
I alway's point out to my client the one's that are clouding up so that if there is a warranty; maybe they can get it replaced.
Interesting, huh?
Hugs, Texas Girl