I know some very old books mention using gasoline for cleaning, but these were written when gasoline was a very different animal regarding additives (and folks were a little more carefree about safety). I think something like Coleman fuel is close to old timey gasoline; camp stoves that are made to run Coleman fuel will have problems with gasoline (except models made for both), mainly due to clogging issues. When I needed Coleman fuel here for my old U.S. made stove the old man at the chemist shop said to use regular benzine, which I have on hand in the workshop for---- cleaning parts. Works great.
8215 isnt the easiest to put back together as there are too many pivots to line up. Takes a lot of patience. Also did you remember to release the power before disassembly? That's how I snapped the escape wheel pivot on one of mine. The click isnt the easiest to find. Pretty easy to overlook.