I like to keep a clean gun. Have sandpaper ready all the time. Those black, dirty guns really turn me off...........Don
Put me firmly in Don's camp.
I certainly don't do this for a livin', so taking time to keep things clean isn't a big deal.
I use lipstick for transfer medium, and I keep a rag, fine sandpaper, and small scraper (modified Xacto knife) handy at all times when using it.
I've also started partitioning metal work and wood work as much as possible.
If time were money, I think this
would be misdirected effort, but as a hobbyist, I just feel better looking at a clean project when I hit the shop.
/mike