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i wouldnt,, i use bleach and water.
the humidity pan also helps disperse the "fans" air,, they say to never use 1 without the pan in there (empty or not) because you will get uneven heat and humid,, so try to find a pan that fits in there as close to the size if the "slot" as you can,, to raise humid you can also throw a sponge in there, half in the water, other half sticking out and up.
edit: ta add,,, i would watch the temp between the hours of 4 am and 8 am ,, thats when you get your biggest difference.