Putting a cup or any item labeled "hand wash only" into the dishwasher can have several consequences, and it's generally not recommended. Here are some potential issues that may arise:
Damage to the cup: Dishwashers use high-pressure water and hot temperatures to clean dishes, which can be harsh on delicate or sensitive materials. Cups labeled "hand wash only" are often made of materials that may not withstand the dishwasher's aggressive cleaning process. This can lead to chipping, cracking, or fading of the cup's design.
Loss of functionality: Some cups, especially those with decorative elements or special coatings, may lose their functionality or aesthetic appeal when exposed to the dishwasher's heat and detergents. For example, thermal mugs with insulating properties may lose their ability to keep beverages hot or cold.
Harm to dishwasher and other items: If the hand wash only cup breaks or damages during the dishwasher cycle, it can cause problems within the dishwasher itself or damage other items loaded with it.
Voiding warranties: If the cup gets damaged in the dishwasher and it is still under warranty, the manufacturer may not provide coverage for the repairs or replacement since the dishwasher use was against the care instructions.
Potential health risks: Some hand wash only cups may have coatings or materials that are not dishwasher-safe and could leach harmful chemicals into your food or drinks when exposed to the high temperatures and detergents in the dishwasher.
To avoid these consequences, it's best to follow the care instructions provided by the manufacturer. If a cup is labeled "hand wash only," it's advisable to wash it by hand using a gentle detergent and avoid the dishwasher altogether. Hand washing ensures more careful treatment of delicate items, prolongs their lifespan, and maintains their quality.
Remember to check the care instructions on all your dishes and kitchenware before loading them into the dishwasher to avoid potential damage and to keep them in good condition for longer.