I guess I did a bad thing to my salvaged aluminum windows by cleaning the aluminum with S.O.S. I'm informed by another post on the forum that the steel can imbed in the aluminum and then rust. Apparently the experts don't use S.O.S. pads on their aluminum for that reason. So, I guess my salvage windows are now educational materials and will soon become roofs for seed starting garden boxes. I have just flunked windows 101 and I'm not even to the measure twice cut once part of building yet.

Kris