Windows might get remarkably filthy, and that actually has an effect on the standard of the light coming via them. Almost nothing says clean like a transparent, shining windowpane. When the time is up, working from major to bottom, scrub any dried-on gunk that has a non-scratch sponge for instance https://trevor0qbjr.theblogfairy.com/31857712/considerations-to-know-about-how-to-clean-the-house