Storefront Windows
Street-facing glass kept presentable on a schedule.
Storefront glass rarely fails because of dirt. It fails because of hands. Palm prints at shoulder height where people lean in to look, nose prints lower down where children do, the grey smear along the edge of a door someone pushes on out of habit, and the tape residue from a promotion that came down two seasons ago.
None of that comes off with a wipe from the inside, which is usually what it gets. It needs both faces done, the frames and the bottom rail with them, because a clean pane in a dirty frame reads as unfinished rather than clean.
This is also the glass that gets the closest inspection of anything you own. A customer stands three feet from it while they decide whether to come in, and they are not looking at your display for the first few seconds. They are looking at the glass in front of it.