Call the township and report it EVERY week. Just realize that it will take at least one business day for an inspector to get there, so don't call the day BEFORE trash pickup. Just in case the tenant actually puts the trash out, YOU will look the fool. Wait until after the trash is picked up. If the tenants' trash is still there, THEN call (or email) the township. If you call in the afternoon, the inspector SHOULD be out the next day. They get the complaints each morning. Also, take photos.