Hey fellow window cleaners. As most of would agree, "french" windows
(those pieces of glass divided by wood or plastic into small squares) are the most dreaded type of windows to clean. It is so tedious! I was just cleaning some the other day, and was thinking that I should pass some tips on to the other window cleaners out there and see what you guys and gals think about doing them.
Well, basically, my method is to spray them with sprayaway
foaming glass cleaner. And then squeegee them. The foaming glass cleaner is mostly water and rubbing alcohol. This is good for not leaving streaks. You could make your own solution with distilled water and rubbing alcohol, but if the concentration of alcohol was too high it would quickly evaporate in your bucket. The foaming action keeps the solution on the glass nicely. I found a Mr. Sanchez Video
where he explains how he also uses this method.
I have heard other people tell me that they use a lot of ammonia to prevent streaks.
p.s. one more tip: I bring a few spare channels with me at cut them to the size of the panes I will be cleaning. I use an angle grinder
to quickly cut the channel to size. Cleaning french panes goes very quickly with the exact size squeegee!
Hope this helps someone
Silverdale Window Cleaning