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I gave the AC/Heater box a good douching with Simple Green's AC Coil Cleaner. It works really good. I can still smell PAG ever-so-faintly. I went around the engine bay with some Simple Green Max afterwards too.
I feel like I'm damn near a spokesperson for them now, LOL.
SG - One of my favorites for outside. It's a different kind of cleaner, just can't hack that smell for too long. Usually fine outside though, or well vented areas. I really like it on concrete for any kind of oil. It brings that oil right back to the top. Think I mentioned that before lol.