Cleaning your windows is an ongoing process. If you notice smudges, fingerprints, dog marks or other dirt on your windows, take a quick moment to clean them off. You can spot clean those with warm tap water or a commercial steam cleaner. Rotate the cloth on the glass if you are cleaning multiple spots.
Deep cleaning windows every two to three months can be best. How often you clean is dependent on the dirt, dust and pollen levels in your area. If you live on a dirt road, your exterior windows will get dirty quicker, and require more frequent cleaning.
Do a cleaning comparison for yourself. Clean two windows that are side-by-side. Clean the interior of one and then the interior and exterior of the other. See if there is a difference in the clarity of the glass. This can help you develop your cleaning schedule for the interior and exterior windows in your house. Your family and your house plants will appreciate the sunshine that clean windows deliver. Many homeowners that live in a cold climate clean their exterior windows in the fall and spring.