quick question about spraying a tank

[DeesBalls]

so im going to get a spray bottle to start spraying down my BP's cage. shes about to shed and i want to make sure he get it all good! couple questions:

1.) do i just spray everything?
2.) do i use hot/warm water, or does it matter?
3.) with everything being moist, do i have to worry about mold?

thanks in advance!