OP stated he is reusing his existing lineset, retrofitting from 410a to 22 split unit.
You can use just about any organic solvent, as long as it doesn't leave any residue. My favorite is brake parts cleaner, followed closely by acetone. I do this a lot with cars also. Almost every car I have ever flushed has the black death in it, whether or not the compressor survived. I honestly don't see how auto a/c systems can run for so long being so contaminated.
The most important part of the retrofit process is pulling a DEEP vacuum on the indoor unit and lineset. Use a micron gage. Make sure it holds vacuum at as low a micron reading as you can pull.
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