Household Cleaning - In English
There are some odors you can get out of an air conditioning unit. But there are also some that need professional help. Oil and tobacco are two examples of very stubborn odors you may need help to get rid of.
"SP459-O Household Cleaning - Air Conditioners - Odors," The University of Tennessee Agricultural Extension Service, 04-0110 SP459O-1M-12/03 E12-5315-00-026-04, http://trace.tennessee.edu/utk_agexhome/18