steel wool
If the holes around the pipes and other gaps are not too big (normal, not like codeman's), use steel wool (stainless steel preferably). The rodents won't touch it and it's easy to stuff in the gaps with a screwdriver and make the house impervious. (Knock on wood), but we've been there since 2001 and did it when we first moved in and have never seen any signs of intrusion when opening. I hate the smell of mothballs so we only rely on this with great success.
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