Yes, windows that aren’t cleaned regularly are harder to clean. In fact, dirt, dust and other organic materials build up on the window surfaces over time. As these accumulations increase in size and depth within the surface of the glass or frame they become more difficult to remove without leaving a residue or scratching the material. In addition to making cleaning more difficult, dirt and debris can dull or even corrode glass components potentially requiring replacement if not properly maintained. All types of windows should be routinely cleaned depending on their location; for example those facing south typically need additional regular upkeep due to direct sunlight causing more rapid accumulation of pollutants. This information was provided by Performance Window Cleaning!