I do the hot water in my condensate line every month. I also just bought an attachment on Amazon for $10 that plugs into the fitting on the outside drain line on one end and the other end has a fitting that plugs into my shop vac. It's called a "A/C drain line cleaner tool".
I used it the first time a few days ago and I was surprised at the gunk it pulled out of the condensate line.
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