https://ask.metafilter.com/326113/Cl...liquid-on-tile
Link above to discussion about removing "oily residue" stains on wood from Damp Rid....lots of hot water..lots.
I agree that "mechanical dehumidification" is probably best solution for boat. If boat is in water with a reverse cycle heating, a poor man's method is to turn heat on, followed by AC..basically doing what a dehumidifier does.