Most people don't notice how dirty their windows are until the sun comes back. Winter leaves a film of road grime and salt on the glass, especially on homes close to busy streets.
Spring adds pollen, which settles on the glass and in the tracks. That's why many homeowners clean windows twice a year: once after the worst of winter, and once in the fall before it gets cold.
Don't forget the sills and tracks. Dirt that collects there gets washed back onto the glass with the next rain, and it can make windows harder to slide.
Pick a cloudy day if you're doing it yourself. Direct sun dries the cleaner too quickly and leaves streaks.
For windows that are hard to reach, or if you'd rather skip the job, call (617) 461-5044 for an estimate from G&S Cleaning Services.