| This stuff is awesome: 

I usually start with mineral spirits and do a final flush with this stuff because it is expensive. Dura II will completely evaporate, and leave no residue. Hell...with a boiling point of 109 degrees F, I'd hope so. Added bonus is this stuff doesn't destroy the o-rings in my flush gun like other solvents do. I paid $32 at NAPA for a quart. I use it on all of my AC jobs because I don't have to worry about residue after evacuating the system. Most of the commonly available flushes are garbage IMHO because you can never get them completely out of your system.
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