The cost difference is smaller than most people think, especially when you factor in your time, safety risks, and the quality of results. Professional window cleaning in Maryland typically runs $7-11 per window pane, which includes both interior and exterior cleaning plus tracks and sills.
Consider that cleaning windows properly takes most homeowners an entire weekend for a typical home. Add the cost of quality equipment, cleaning solutions, and the safety risk of climbing ladders for second-story windows, and the professional option becomes very reasonable.
The biggest difference is in results and longevity. Professional cleaning with deionized water and specialized techniques prevents the streaking and water spots that plague DIY attempts. Your windows stay cleaner longer, and you get significantly better natural light penetration and curb appeal – making it one of the most cost-effective home improvements you can make.