The answer to 'window cleaning buildup' is that it is a common issue caused by a buildup of dirt, grime, and hard water deposits on window glass. Symptoms include streaks, hazy or cloudy glass, and a dull appearance. The solution is to use the right cleaning methods and products to remove the buildup.
For light buildup, you can often remove it by cleaning the windows with a vinegar or ammonia-based glass cleaner and a microfiber cloth. For tougher buildup, you may need to use a scrub pad or squeegee to physically remove the deposits. Be sure to rinse the windows thoroughly afterwards to avoid leaving behind any residue.