Clutch slipping after trip at glasshouse, new HD NPC clutch.
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If it were me. Keep hosing it out until its clean water. Then take it from there. Theres a chance you have damaged the clutch plate friction pads and also maybe the pressure plate facing where it meets the clutch plate. You wont know until its removed.
If you go down the gearbox removal path, get whoever is doing the job to seal up the entire housing, including the rubber boot.