The answer to 'window discolored' is that there are several common causes for window discoloration, including mineral deposits, hard water stains, and environmental factors like smoke or pollution. Symptoms can include hazy, streaky, or cloudy-looking windows that won't come clean with regular window cleaning.
In many cases, window discoloration can be addressed through DIY cleaning methods like vinegar or commercial glass cleaners. However, severe or stubborn discoloration may require professional window cleaning services to fully restore the windows.