With mice and other nuisance wildlife infestations, it is critical to find the potential entry points and seal them; otherwise, the infestation will never be permanently resolved.
We carefully inspected the entire home, filling every hole we could locate with spray foam. The before/after pictures highlight that the gaps that were once open are now closed off. During my inspection, I also noticed a large gap underneath the front door that would allow mice to enter. I installed rubber weather stripping to seal that potential route.