Karnak: Doesn't take a lot of effort. Next time you sit in front of the TV take a few parts and just start working idly. Same way some women knit in front of the TV, I've modeled in front of it. If you have a TV tray that's helpful, but if not just leave the box in the work room and take the x-acto and a few major parts into the TV room. Trim the pour gates, use a file on certain areas, maybe a sanding stick. Dry fit. On commercial go swap out the "cleaned" part for an "uncleaned" one.