The biggest issue might be some of the chemicals that do not evaporate quickly: e.g. Dipropylene Glycol Monomethyl Ether (b.p. ~190 C), esterified soy oil etc. Though the chemicals were probably nonconductive per se, they may be hygroscopic (picking up water from the air) and certainly would adhere dust. If you believe some got between parts and the circuit board, you might try to gently remove them:
Use bibulous paper (aka absorbent paper towel) to wipe and to wick away as much junk as possible.
You might try washing the contaminated parts of the board with a pure solvent that will not attack the board or components, but it is has risks. For example, ethyl ether is a solvent that evaporates very rapidly, is comparatively nontoxic but is highly flammable, often causing flames to flash back to a container and setting it on fire, as well. Methyl chloride is an effective solvent but is quite toxic and might attack plastics. For those reasons, unless you're under the guidance of an experienced technician, I would not recommend using solvents.
So rather than doing further damage, you might best take the machine to someone who services them and can remove the glop, or you can take a chance and close it up, hoping it will work and not accumulate a conductive layer on the PCB.