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You've got to let everything dry before a vacuum will be effective, and even then it's iffy. Try using a short bristle brush to sweep the crud off of the fins. Don't become aggressive, because if you bitch up the fins, that will reduce airflow over the coilset. I don't recall the name, but unless you're a certified refrigerant technician with appropriate tools and training, you shouldn't be messing with the refrigerant system. None of the shops I deal with would sell it to you if you weren't on their list of techs with a cert.
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There ain't nothin' more powerful than the odor of mendacity -Big Daddy
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