You will have to do that flush several times as the fluid in the struts and accumulators only circulates with the action of the suspension going up and down.

To do it completely, one would have to compress the struts, bleed the accumulators out, do the flush as Doc states and bleed the lines to the valves. If I had a drive on lift I would start by doing the flush then I would release the valve bleeders which would let the car sink and discharge the accumulators. With the bleeders open I would start the motor and bleed the lines. This is going to do a good job of the front end and lines. I would probably fill and raise the car then bleed it down at the valves a couple times to wash the struts. The struts and accumulators are the most vulnerable to the wrong fluid.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician