Without access to air you are looking at a lot of work... with a 90 degree grinder and several grades of scotch brite discs you should be able to rough it out very quickly...I'd stay away from anything too agressive it will only make for more work on the back end, finishing... I don't mean to offend or come off like a knowitall but I polish for a living and know that without the right tools it is very time consuming. good luck
