I've seen lots of great suggestions on this site for cleaning and maintaining a playfield and thought I'd add one of my own. The problem we were trying to solve was how to clean dust and dirt off of a playfield under ramps and in tight corners too small to get at with our hands without dismantling the entire board. We came up with a solution using pipe cleaners, swiffer dry dusters, and scotch tape. We cut a strip off the swiffer pad. Then wrapped it around the end of the pipe cleaner. Then we doubled over the top of the swiffer and taped it to the pipe cleaner. We ended up with a ball of swiffer at the end of the pipe cleaner that could reach every spot under the ramps and past captive pinballs. For the really hard to reach spots, we tied two pipe cleaners together. Worked perfectly.