Well it finally happened. I am typically quite careful with using a can of air (not really air, but air is much easier to spell) usually squirting out about 1/4 of the can before I use it on anything of importance, but this one got me. As I was dusting off a negative the can puked out a stream of liquid, which leaves an interesting mess on a negative when dry. This was not on the emulsion side, so's I can't say if this works or not on that side. I slid the negative back onto a reel (120 film, I shoot 6x7, I cut them into two's) and in the tank it goes. Poured it full of DI water (distilled or RO should work fine) with just a splash of diluted photo-flo. Shook it for a minute and let it sit for 5 minutes. Hung to dry.
Came out fine - no marks that I can find. ...whew!
I should look into a small air compressor. Of course then I would have to plumb the darkroom, two or three places, and locate the compressor in another room so it doesn't interfere with listening to the music. Heck, I'll just keep using the can.