George,
What may have happened is that clutch disk bonded ("rusted") itself to the flywheel or pressure plate from the moisture of the pressure washing. This is an easy fix, but first verify that the slave push rod is moving the ZF clutch arm. If that's ok, then raise the rear wheels off the ground. Put the shifter in first gear and start the engine. Next, depress the clutch pedal fully and hold. With the engine running and the clutch pedal fully depressed, quickly apply the brakes. This should free the clutch disk. If not, repeat.
John
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