Re: Interior glass cleaning?
First I put an old towel on top of the dash to protect it from overspray.
I give the inside of the glass a good spray of Stoners. Then I wipe it off with a Costco MF towel on the end of one if those glass cleaner handles that let you reach into all the corners.
Then I do it again, using a new towel. Generally, after two cleanings there isn't a trace of film and the glass is absolutely clean for another month or so. At least on the inside.