On preformed stamped parts I usually only use a file, swipe it down several times to get it smooth, then angle it and swipe it down to take the edge. On the -4 there are lots of edges that has to be cut manually, then I start with a vixen file. I use the multiburr tool on larger holes.
I used the scotchbrite wheel a lot earlier, but seem to use it less and less,I find that files/vixen works faster and with a better finish.