MilesTeg: I've never had problems getting empties out of the chamber. I know that Brownells sells a round ceramic rod that you can use to polish the chambers of a .38. Dunno if they sell one sized for .22.
Regarding polishing the rebound slide, I strongly suggest that you get Jerry Kuhnhausen's book before messing with the internals. I was advised here on TFL very strongly to stay the f*ck away from the sear unless I knew what I was doing (which I don't).
In terms of polishing the rebound slide, I simply took it out, and polished the top, left, and right sides of it lightly. I used flat stones and oil, but don't remember the grade (probably fine). The rebound slide is painted, and I basically polished off the paint.
Then I lightly polished the area of the frame where the rebound slide sits (both the bottom portion and the sides). There were very light tool marks on the frame that I polished out. I did some of the polishing with flat stones, but most of it with a small piece of 600 or 800 grit sandpaper and oil.
DON'T REMOVE MUCH MATERIAL. Just a very light polish. I AM NOT A GUNSMITH, so don't think this is professional advice.
One final piece of butt-covering advice. Messing around with the action of any gun can potentially make the gun very dangerous if you don't know what you are doing.
M1911