Re: That Smell? Victory....maybe?
If the grease began to decompose chemically, due to heat and age, sure I can imagine it stinking up.
Living in the PNW, and cooking aboard, I think you have a real uphill battle with fighting mold. I keep a bottle of plain old, Formula 409 and a small, green scrubbie sponge onboard. Anytime I see a black speckle of mold- "Blamo!" It gets 409'd and scrubbed.
You could get a dehumidifier and plumb it into one of your sink drains. It's another electrical load, another appliance to trip over though.
S/V Old Shoes
1973 Pearson 30 #255