Our mice access the TM from many points - A/C, grills, gaps in sides, gaps in bottom. There is no way we could seal them all. We pull it out every two or three weeks and clean it. We use lots of sprays/oils, and keep all carpeted/cloth surfaces covered with adhesive carpet protectors. Any time we use it, we discard protectors and do a thorough cleaning. The trickiest part is the A/C - one of their favorite access points. I'll be taking it apart for inspection in the next few weeks. My opinion, if you don't have mice in yours, you don't have mice your area.
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