Experts say chef knives should always be hand washed. … “A dishwasher can be detrimental to the quality of your knife,” she says. “They are often too abrasive and based on the type of detergent used, the process can cause rust or corrosion.”
Similarly, does putting knives in the dishwasher make them dull?
“The water jets in the dishwasher can cause the knife to knock into whatever else you have it in the dishwasher with, and can damage the edge,” says Moses. … Then there’s the detergents, which can be just as dangerous as the machine itself, causing knives to dull or discolor.