We Examine glass and window cleaners in various approaches. First, we evenly smear black glass check panels with greasy fingerprints, a dusty/greasy mix and lipstick marks. We use black glass because it’s easier to https://s3.amazonaws.com/windowcleaners/top-window-cleaners/Clearing-the-Panes_-A-Look-into-the-World-of-Window-Cleaners.html