Some dishes and cups can get damaged when washed in a dishwasher due to a few reasons:
Material Sensitivity: Dishwashers use hot water and strong detergent along with mechanical agitation to clean dishes. Some materials, such as delicate china, crystal, or certain types of plastic, are not dishwasher-safe. These materials can be sensitive to heat, harsh detergents, or the intense water pressure in dishwashers, which can lead to discoloration, warping, or cracking.
Temperature Extremes: Dishwashers use hot water for effective cleaning, and the temperature can reach high levels during the washing and drying cycles. Sudden temperature changes can cause thermal shock, especially with delicate items like fine china or glassware. When exposed to extreme temperature variations, such as rapid heating followed by rapid cooling, the dishes or cups may crack or shatter.
Incorrect Loading: The way dishes and cups are loaded in the dishwasher can also contribute to damage. Placing items too close together or stacking them can cause chipping or breakage when they collide during the wash cycle. Additionally, placing items in the wrong section or not securing them properly in the dishwasher's racks can result in movement and damage.
Harsh Detergents: Some dishwasher detergents contain strong chemicals and enzymes designed to remove stubborn stains and grease. While effective for cleaning, these detergents can be abrasive and cause damage to delicate surfaces over time. Using the wrong type of detergent or using too much can accelerate the wear and tear on dishes and cups.
To minimize the risk of damage, it is important to check the manufacturer's instructions for dishwasher safety before placing dishes and cups in the machine. If items are labeled as "hand wash only" or "not dishwasher-safe," it's best to wash them by hand to avoid potential damage. Additionally, using milder dishwasher detergents specifically designed for delicate items and following proper loading techniques can help reduce the risk of damage in the dishwasher.