Came up with what seems to be a good method for a thorough flush:
1) Pump fluid out of reservoir with baster or shampoo pump.
2) Slip serpentine belt off P/S pump pulley.
3) Disconnect expansion hose from P/S pump and allow to drain.
4) With engine off, work steering wheel lock to lock many, many times. Steering rack will pump remaining fluid through P/S pump and out where the expansion hose was connected.
5) Find a honkin' jar, clean, and dump in a quart of ATF.
6) Submerge end of expansion hose in jar. Work steering wheel lock to lock many, many times. Steering rack will suck fresh ATF out of jar, through expansion hose, rack, and pump into drip pan.
7) Pour what's left in the jar into the reservoir and spin the P/S pump pulley to flush reservoir and pump.
8) Reassemble, fill, and bleed.
