If you've used the machine in a home with mould spores and plan to bring it with you to a new home or RV, there is a possibility of transferring the mould spores.
The heat in the unit can kill the mould spores however as you cannot clean the fan, there is a chance that there will be remaining spores that might transfer.
Hence, you will need to clean the mould area before you start using a dehumidifier.