Yep - I do a clean out as well and I know mine are not sealed enough to keep the smaller pests out. I typically have everything from mice to snakes to wasps. Typically I pick as cold a day as I can to do the cleaning - the cooler temps slow them down. Armed with rat bait, a large stick and a can of wasp spray. Never had what you got foggy, but plenty of mice nests and wasp nests to contend with. I typically just let the snakes alone - we have very few that pose any real danger to people in my area and most will help keep the mice in check. Ran out of spray one year - that sucked! Had one that really didn't like me he got me 3 times, but he paid the ultimate price in the end.