Beginner Questions (Ask Them Here!)

I was recently given a small humidor. The guy who gave it to me liked to put a shot of rum in the bottom of it to flavor his cigars, I would never do this method myself but that was what he liked. So the rum actually spilled onto the bottom of the humidor and now is stuck in a glob is there anything I can do to get it off? I didnt think that it would be good to use any chemical solutions and just scrubbing it with a wet paper towl did nothing. Is there any way i can save this humidor?