For the small increase in value from #2 to #1 it would not pay to buy chemicals nor is it worth the extra time and effort.
I do agree that cutting them open is well worth the time! I do HVAC work and get a few large units a week.
I just put all the compressors to the side until I get a bunch of them, then I line them all up and cut open with my cutting torch. Yes it does cost a little for the fuel to cut them open, but with 15 or 20 all ready to go at the same time it's worth it!
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