Quote:
Originally Posted by vintageogauge
If you run a gallon of hot water through the drain pipe monthly you shouldn't have any gunk in there. If you want to be sure add a little vinegar.
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Ditto. Ten years ago the HVAC tech told me to put 1/2 cup of vinegar directly into each drain pipe; let sit 30 minutes and flush with 1/2 gallon of water. I put a reminder on my phone and each year the tech is impressed how clean or drain lines are. Easy effort to avoid big problem later.