Go to a rental place and get a small ozone generator. We used to use them to remove smoke odors after a fire or construction odors after a remodeling project. It will not take a big one to get rid of any lingering odors and you can put a cap over the tank vent to minimize odor escape. Be sure to clean the AC filters with soap and water first. You may also want to check the gasket on your toilet to see if the odors are coming in through the toilet. If the bowl will not hold water, the gasket is bad.