Opossums frequently become trapped inside trash cans as they search for food. If you find one inside and you have not been exposed to its saliva or other body fluids, wait until nightfall and then gently push the can over on its side and walk away. Keep children and pets away as well. Opossums won't leave until they feel safe.
Wear gloves when handling the can. The next morning, check the can from a safe distance. If the opossum is gone, spray the can with 10% bleach solution to kill any viruses, and let air dry. Watch out when using bleach as it can stain clothes and hasten the corrosion of metal.
Resources: (online)
Opossum
