The situation you describe. I had a new AC installed and neglected to clean the line. The condensation line got more and more clogged. I would at first get intermittent stoppages as the condensate level reached the safety cutoff switch. But it would come back as the condensate gradually seeped out. As the season progressed it became more of a problem to the point where I discovered the blockage. I tried the outlet air from a wetvac with no success. Then took a hose with no metal fitting and shoved it into the drain line. Taped it in place to seal the connection. Turned on the hose and it cleared it immediately. Since then, I use that method as a preventative. I think better result than hoping vinegar/bleach will work. Takes a couple of minutes to set up and you know immediately that it worked.
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