Kodak's recommendation for mold removal is to use dry isopropyl alcohol but only on the emulsion side. There are better solvents for dirt, if you can find them, such as 1,1,1,trichlorethane, now hard to find because it is an envrionmental hazard.Richard,
Is this the same as trichlorethylene? If so, Home Depot or hardware stores sells it under the brand name of Sunnyvale or Sunnyside or whatnot, only about $23 a gallon.
I use it for hand coloring BW prints--it is the same as Marlene solution sold in Marshall's kits, but a heck of a lot less expensive. David Lewis uses it to clean his bromoil brushes because it leaves no residue. Outside, of course. But don't store in styrofoam--it'll eat right through the bottom. It is apparently the same stuff used in dry cleaning or some such thing.