Woah, I don't believe Wingman was talking about using motor oil for paint stripping. Castrol Super Clean is a cleaner, degreaser found in automotive bepartments. It works well for removing paint and Wal-Mart has it in a purple 1 gal. plastic container as "Super Clean".
As for cleaning in tight areas, good quaiity pipe cleaners work very well, but you might also try going to your local grocery / department / drug store and check out the small brushes in the dental supply section for cleaning braces, orthadoncha (sp?), etc. You will find them for a couple of bucks and in cylindrical shapes.
Hope this helps,
Michael B.