Hire a professional window cleaner if you have hard-to-reach windows, large glass surfaces, or multiple stories. Regular cleaning every 3-6 months is ideal for maintaining appearance and longevity, especially in areas with heavy pollution, coastal salt, or harsh weather. Professionals ensure streak-free, thorough cleaning with the right tools and techniques, enhancing curb appeal and preserving window integrity. Additionally, hire them before special events, when selling your home, or if you lack the time, tools, or physical ability to do it safely yourself. Their expertise can prevent damage and extend the life of your windows, saving you money in the long run.