As long as you are changing the filter on your A/C unit, IMHO, "cleaning" is not required or necessary. Dryer vent, yes, these do need to be cleaned occasionally. We are very careful about cleaning the filter in the dryer, and there still was some build up in the dryer vent, not much, and after 4 years of use.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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