is the mold in the tub that contains the eggs, or under it / outside of it?

im not sure im getting where exactly the mold is.

also im doubtful about vinegar. the fumes are more volatile than water vapor, so it can evaporate and then condensate elsewhere. Also the bacteria could view the vinegar as food and metabolize it; many animals can get nutrition and calories by properly metabolizing vinegar, who is to say bacteria cannot?

is the issue is between the two tubs, meaning between the larger and smaller tubs? If it is, just clean it as good as you can. (bacteria need to eat something, so there must be some residue, they can even eat dishwasher residue). after cleaning, wash with clean fresh water. and then table salt may do the job. At least the salt wont move through the air from one body of water into another, so outside the egg container itself, table salt may work nicely.