At 206k km, did this procedure last night on my '09 SpecB. This past winter the power steering pump had been complaining, especially on the coldest days, and the fluid was very dark.
I started with the steering wheel lock to lock flush after disconnecting the return line, adding new fluid to the reservoir as needed. I also unbolted the reservoir (2 bolts) so I could more easily plug the return line port on the reservoir (and clean up the drips!). Once I saw new fluid in the return line from the lock to lock flush, I opted to turn the motor over to flush the pump rather than take the belt off and turn it by hand. I topped the reservoir up to the top, turned the motor over and killed it once it caught. I'd estimate 1, 1.5 seconds tops. This method draws the fluid in the reservoir down very quickly. Did it twice, re-filling the reservoir on the second go and got new fluid returns.
Hooked the return line back up, filled to the "cold max" line and turned the steering wheel lock to lock again a few times. I noted that the reservoir fluid level dropped a small amount after cycling the steering and suspect the system purged some air.
Topped it up a final time and took it for a drive. Butter smooth, silent pump.