If you see spots on your cutlery after running them through the dishwasher, it could be due to a problem with the dishwasher’s tubing. Specifically, the tubing that supplies cleaning chemicals to the dishwasher may be clogged or stuck, preventing the chemicals from being adequately distributed throughout the dishwasher.
To fix the issue, you should first check the incoming supply of cleaning chemicals to ensure they are properly delivered to the dishwasher. If the supply is working properly, then it may be necessary to inspect and clean the tubing to remove any clogs or obstructions that may be preventing the chemicals from being properly distributed. This may require the help of a professional appliance repair technician, who can diagnose the problem and clean or replace the tubing as needed.