How do I clean the spray arm nozzles?
Remove the top spray arm by removing the empty top rack and turning it upside down. Turn the locking nut counterclockwise to release the spray arm. Look for obstruction in the nozzles and flush them under running water if needed. For the bottom spray arm, grasp and lift it from the bottom rack and flush under running water.
From the official Bosch Ascenta 300 Series Dishwasher manual, page 14
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