bowl, serving spoon, glass, or other item has sentimental or monetary value and you are unsure how it was made, wash it by hand.
Older pieces may contain delicate glazes, adhesives, hand-painted decoration, or materials that were never tested for modern dishwasher conditions.
Dishwashers
Why Dishwashers Can Be Harsh
A dishwasher does much more than spray warm water. During a typical cycle, dishes may be exposed to:
Strong alkaline detergent
Pressurized water jets
Hot wash and rinse water
Extended moisture exposure
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