How can I remove residue left after removing aluminum foil from my windows?
Sodium hydroxide or the main chemical in draino will dissolve aluminum. The green coating on the pellets is aluminum when in contact with water it causes a boiling effect , but I would use razor blades. Years ago when tinting windows was big we had to get the windows perfectly clean or bubbles in the tint showed. We used Windex and razor blades then a final wipe with a micro fiber cloth. The Windex or other window cleaner actually created a lubricant effect and the blades lasted longer but when debris are shaved off it helped to float the dirt and residue off the glass.