I've been told to put a cup of vinegar down each month Or bleach. I forget which one because I don't do it. I have a float switch that will shut the unit off if the water in the condenser Pan gets too high.Then I can clean the outside tube drain with my wet back.My unit was 3 years old now and I haven't done any maintenance on it. If you pay in for twice a year maintenance they should suck out that drain line each time for you.
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