What is the proper water temperature for dishwashing?
For best dishwashing results, water should be 120°F (49°C) as it enters the dishwasher. To check water temperature, run hot water at the faucet closest to your dishwasher for at least 1 minute, place a candy or meat thermometer in a glass measuring cup, and check the temperature as the water runs into the cup. (Page 12)
From the official Whirlpool W10021620 Built-In Dishwasher manual, page 12
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