Inside, outside, and the screens and tracks that make the difference.
Quick answer: Window Cleaning. Southeastern Renovation is a licensed South Carolina general contractor (CLG.127339) serving the Charleston Lowcountry and York County, SC. Work is coordinated by Southeastern Renovation as the general contractor. Licensed trade subcontractors handle work requiring their trade credentials; permit responsibilities depend on the project scope and jurisdiction. Call (843) 718-8177 for an estimate.
Salt and pollen are the local complications. Near the water, salt film builds on glass and etches over time if it is left; in spring, pollen coats everything and returns for weeks, which is worth timing a clean around.
Hard water spotting from irrigation is the other one, and it is the one that becomes permanent. Sprinkler overspray hitting glass repeatedly leaves mineral deposits that etch into the surface, and past a point they cannot be cleaned off at all — only polished or replaced.
Screens hold dirt and hide it. Cleaning glass behind a dirty screen produces a window that looks no better from inside, which is why screens come out.
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Usually the screens. They hold a film that you look straight through, so glass cleaned behind a dirty screen looks no better from inside.
Tracks and frames do the same at the edges.
Most often mineral deposits from sprinkler overspray. Caught early they clean off; left long enough they etch the glass, and at that point they are permanent.
It is worth aiming irrigation away from windows.
After the pollen has finished rather than during it, unless you are happy to do it twice. Near the water, salt film builds year-round and is worth not leaving too long.