POE is OK in a R22 system. Mineral oil in a HFC system is OK as long as it's less than 5% or so of the total oil capacity. If there's other junk to get rid of, nitrogen is the way to go, but an air duster can (really R152a) is a good substitute for a one off.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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