Glass Gleam-3, by Titan Laboratories - This solution is biodegradable and USDA approved, and it is designed specifically for cleaning glass and window films using a squeegee. Glass Gleam-3 uses a new state-of-the art formulation, designed specifically for the professional window cleaner. It outperforms any other cleaner available. Tests with leading window cleaning companies and a survey of window cleaners who switched show conclusively that it is the product they prefer the most. Because Glass Gleam-3 is super-concentrated, it is the best bet for your money.

According to wikipedia, the "swivel method", or "fan method" as it is referred to by professionals for squeeging glass, and it uses a series of strokes combined with turns that hold the water away from the leading edge of the squeegee; when the turn is completed in the opposing direction, there is no water and no dirt left isolated. However straight strokes, either horizontally or vertically, are normally much more efficient than “fanning”. If a few spots are missed, a chamois leather cloth works better for touch up than a towel of cloth or paper.

When using a squeegee for window cleaning a common problem people come across is run lines. This is caused by the squeegee being angled incorrectly forcing the water under the rubber blade out into the dry area of the glass or from solution being pushed up into the top edge of the window. The squeegee should instead be tilted in the direction that the blade is moving across the glass to force to water into the wet area of the glass.