Ye olde Diseasel went on its first road trip in 10+ years yesterday and it became apparent shortly into the journey that the A/C needs fixed. The question is where to start, what should I be looking for, any special considerations that need done "while I'm in there"?

Car in question is an '86 300SDL (W126). Right off the bat I'm already replacing receiver/dryer, pressure switches, and Schraeder cores. Additionally the compressor is completely locked up. Can't budge it even with a cheater bar, so I'm assuming I'm in for some cleaning and/or flushing. The question is what should I be doing to get all the old crap out of the system?

I'm just going to get a new compressor, not worth trying to repair or rebuild the one that's in there. I have a 30# can of R12, so I'll be going back with R12 refrigerant as well.

The condenser, evaporator, expansion valve, and hoses/joints are all dry (no oil) so they appear to be in good condition, however I'll change out the O-rings as a precaution.

So the question is: How to flush/clean this system? Surprisingly in my 20+ years of working on cars, I've never had a compressor failure or had to deal with anything like this. I can fix leaks and swap out a clutch or failed components, but I've never had to clean up after a compressor failure!

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]