Dirty glass is the easiest thing in a building to stop noticing, because it happens a pane at a time over a season. Salt air and winter grit on the Seacoast are particularly good at it, and the result is not a window that looks dirty so much as a room that looks dim. Perham washes the glass inside and out, which matters because interior film and exterior film are different problems and doing only one leaves the window looking half done. Window washing is the second thing the owner names as his own specialism alongside floor care. The pricing is unusually plain and it is published on their own site: a flat rate per window, with screens and storm windows each priced separately as extras rather than bundled in. That means a house with a lot of storms is not quietly charged as though it were a house without them, and you can decide to have the screens done or not. Tell them roughly how many windows, screens and storms and the number is straightforward to work out in advance.