Hi, at the lab I go to they used ethylalcohol to clean the really cruddy negs the customer thomped upon (or whatever). Sometimes it worked. Sometimes not. If the crud is embedded in the emulsion, you are 90% out of luck. There are some commercial negative cleaners made by Tetenal, but I believe them to be alcohol as well. Washing the negative in distilled water wouldn't harm it either.
Especially with the alcohol, try it out on some crap before :) Best regards, Frantisek Vlcek
