I find Pec-12 smears my negatives and slides. Especially if it gets on the emulsion side. Much better results with Ronsinol lighter fluid. Works great on both sides and evaporates quickly.
I have also had good results cleaning old, sticky and dirty negatives by very gently cleaning with hand soap and fingers under running water. Followed by a soak in C-41 stabilizer and hang to dry. (this measure only to be employed when more traditional methods fail).