How do I clean the spray arm nozzles?
Remove the empty rack and locate the spray arm. Turn the locking nut counterclockwise to remove it and inspect the spray nozzles for obstruction. If cleaning is needed, flush the nozzles under running water. Reinstall the spray arm by returning the locking nut and turning it 1/8 turn clockwise.
From the official Bosch Series 800 Dishwasher manual, page 20
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