One thing that I do, besides clean it (when the time comes) is that about 15 minutes before I need to turn the A/C off, I turn it to high fan (NO A/C- compressor on) to evap most of the moisture on the coils. In some cars they found that molds and fungus can grow there causing odors. So far it's served me well on the cars and seems like an easy crossover to the Airstream.
Computers manufactured by companies such as IBM, Compaq and millions of others are by far the most popular with about 70 million machines in use worldwide. Macintosh fans note that cockroaches are far more numerous than humans and that numbers alone do not denote a higher life form. -NY Times 11/91