Top rack items are not getting clean while bottom rack items are mostly fine.

Safety first: Turn off power if removing spray arms with tools.

Step-by-step checks:

• Rack position: Ensure the upper rack is fully pushed in and properly engaged with the rear water feed.
• Clean upper spray arm: Remove the upper spray arm and flush it under hot water. Use a toothpick to clear blocked holes.
• Feed tube inspection: Check the vertical or rear feed tube for cracks, disconnections, or obstructions.
• Pump performance: If upper cleaning remains poor, the circulation pump may not be delivering enough pressure and may need replacement.

Warning: Do not drill out spray arm holes; this will alter spray patterns and reduce performance.