Well, I've shaken and brushed it out. You can't really get your hand inside a Ratzapper anyway. I also try always to use gloves when handling the thing.
I check every couple of days - but using only a mirror to look inside, rather than picking it up.
I was thinking of trying peanut butter - or somesuch - rather than the pellets supplied with the Ratzapper, but am concerned it would get smeared around inside and would be very difficult to clean up. Any comments? Maybe Nutella or peanut butter spread on a biscuit or something?