Here are a few simple ways in which you can clean sliding glass windows: Use a small duster or pointed nozzle of a vacuum cleaner to brush out any dirt or debris from the window track. Lubricate the machine track occasionally using machine oil to avoid jamming over time. Remove your operable windows from their frames completely if you want to go for a ‘deep clean’. Set it against the wall and use a gentle cleanser/mild dish soap with a wet cloth to clean the window tracker and the glass panes. Use a ladder/step stool on a stable, dry and flat ground if the sliding windows aren’t within your immediate reach from the outside. Clean them using a long-handle glass cleaning tool and soap-water mixture.