Last fall I tried one of the "Glade" air fresheners, the one that is powered by two AA Batteries and emits a short spray about every 30 - 45 minutes. It worked well and was very subtle and not overpowering, however, it would cause my CO detector to go off. I was really concerned there for awhile because I didn't know that was the cause until I did some reading where the issue of certain air fresheners and the detectors were addressed. I remedied that by moving the freshener to the rear of the camper and away from the detector.