Recently we bought a piece of Tuff-R -- I guess you would call it a styrofoam insulation board -- and cut it to fit a small window exactly. It is a temporary measure, to get through the winter. The small window is a jalousie type of window that loses a lot of heat. I would call the project a success, but it was messy work because the little styrofoam crumbs stick to your clothes, blow around unpredictably, and are hard to clean up.
I would like to do this again for another window. What is a good way to minimize the mess when working with this material?