I assume that the mold on the wood, is because the wood wasn't sealed with a lacquer or finish or paint. I suggest spraying diluted bleach onto it and letting it air dry. I would use the 1 part bleach to 3 parts water if I were you. You should rinse it after the bleach has dried to try and rid of the smell or vapors of the bleach. If you have eggs in this cabinet, I suggest putting them in the other cabinet, or another type of incubator, maybe a 'quick rigged hatcher.' I wouldn't leave those eggs with that mold.