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Define "cleaning the air conditionner".
Cleaning the air distribution conduits? Cleaning the actual refrigeration system?
Both questions have no clear cut answers. You may not have to clean the air distribution system ever, or you may have to do it often depending on how much and how you use the AC, how often you service the cabin air filter, etc. I don't use my AC very often, and when I do I manually afterblow it to dry the evaporator core to keep funny smells from developing on a wet core left to sit. If you live in a humid climate and stop your car with the AC on full blast, you're basically leaving a big puddle of standing water in your dash that can grow algae or fungi and stink up things. If it ever starts to smell, they sell sprays for that stuff that you can shoot into the ac fan while it runs to kills that stuff and get rid of the smell.
Some makers build in an afterblow function into the AC which keeps the fan running after the car is shut down to dry the evaporator. The twins don't have that, just turn off the AC and keep the fan blowing a minute or two before you reach your destination to avoid the problem.
The refrigeration system can go the life of the car, or it may not. normally, as long as it's sealed and contaminants are kept out it'll work as it should. Even if you spring a leak, as long as you catch it quick and the empty system isn't left to stand in the elements with a hole in it, contaminants shouldn't enter and a simple repair and recharge would be all that's needed to return the system to normal operation. If you've got a nasty situation like a compressor that failed internally, then yeah, the system would need to be flushed and condenser/filter replaced to avoid shrapnel from the old compressor killing the new one.
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