There is a lot of different points of view regarding the coffee grounds.
personally I've never had problem, living in south Florida with no AC room. but after enjoy the coffee I dry it very well. after 6 years, knocking wood I never suffer any kind of infestation product of the coffee use.
Now is that when you use it on the layout or just in general?
I have to worry that if you use it on the layout that it would make a lousy cup of coffee..........