AC cleaning

Have you ever got you air conditioning cleaned?  It's very common here. The Vietnamese say that the combination of dirt and constant use of the air conditioning due to the high heat means you "have to" to get your AC cleaned.  They say it makes the system more efficient.  Some have it cleaned every three months. 

They charge $5 per unit to clean it plus the cost of freon if you need it topped off. In Vietnam they don't have central air but rather each room has its own unit. That way you can go into one room and only is the AC there thus saving money. 

To clean the units they spray down with water the inside (out put) and outside (intake) units. 

In the end I'm not sure how much good it does to clean the units but the extra freon is nice.