Rodents are very common pests around here, and with our continuous rain and occasional cooler days around this time of year, they are going to look for warm and dry places to live or mate. You may begin to see more rodent activity around or inside of your home for this reason.
Rodents do not choose where they live based on cleanliness; instead, they base it on if the location is a safe and easy place to get to.
They can also fit into spaces as small as half an inch, making it easy for them to squeeze through even the smallest openings around your home.