The drain tube just lays in the tray just lift it up and pull the end off and clean the end with a toothpick and old toothbrush. The tube itself is likely not clogged, its the end that clogs up. The end is there to provide a tiny hole to water to exit but prevent bugs from getting in.
You can swab the inside of the tube with a pipe cleaner if you want it perfect.
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Randy - Manhattan, Kansas
2015 Vista 27N
2020 Ford Escape Hybrid