In all my years of boating have not had to use any type of backwash for any of my AC's. I also have heard that a solution of muriatic acid will clean out lines. Have seen it work for neighbors toilet discharge hose. Nasty stuff; be careful.
Coils, not water cooler...
Most home stores like Lowe's and Home Depot have a mild a/c coil cleaner in a spray bottle.
Just follow directions.
If you use an acid that is too strong, it will corrode the fins.
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