The answer to 'when to clean window' is that most experts recommend cleaning windows every 3-6 months. This helps maintain clarity, prevent buildup of dirt and grime, and keep your home looking its best. Regular cleaning is especially important for windows that get a lot of exposure to the elements, such as those on the south or west sides of a house.
For best results, clean windows on an overcast day or in the shade to avoid streaking. Use a microfiber cloth or squeegee and a mild glass cleaner to wipe down the glass. Be sure to clean both the interior and exterior of the windows for maximum impact.