The hollow spaces under concrete stoops can be filled in with instant concrete. Ammonia-soaked rags may be placed inside or outside the entry hole. After the third day, tape a piece of paper over the hole and monitor for 24 hours. If it remains unbroken, the animal has vacated. Make repairs immediately.
Nocturnal animals climb out after dark.
To effectively discourage garbage-raiding, store garbage cans where they cannot be reached or use cans with lids that can be tied or locked in place. Ammonia-soaked rags can be placed on top of the garbage can before securing the lid. Removing one animal does not eliminate the presence of others. Relocation causes stress for the animal, for any young left behind, and for the exisiting population at the place of release. It is illegal to relocate wild animals to any forest preserve.