Question

Why do all of my insulated cups say ‘hand wash only’ or ‘not dishwasher safe’? What will happen if I run them thru the dishwasher?

Answer 1

Insulated cups typically have a label that says "hand wash only" or "not dishwasher safe" because the high heat and harsh detergents in dishwashers can potentially damage the insulation and other components of the cup. Here's what might happen if you run an insulated cup through the dishwasher:

1. Warped or Damaged Insulation: Insulated cups are designed with a vacuum seal or double-walled construction to keep liquids hot or cold. The high heat in the dishwasher can cause the insulation to warp, leading to a loss of insulating properties and reducing the cup's ability to maintain the desired temperature of your drinks.

2. Seal or Lid Damage: Many insulated cups have lids with silicone or rubber seals to prevent leaks. Dishwasher heat and detergents can degrade these seals over time, compromising their effectiveness.

3. Outer Coating or Paint Damage: Some insulated cups have decorative coatings or paint on the outside. Dishwasher cycles can cause these coatings to peel, fade, or chip.

4. Structural Integrity Issues: The repeated exposure to high temperatures and water pressure can lead to weakening of the cup's materials, affecting its overall durability.

5. Leakage or Water Trapped: If water gets trapped between the cup's walls during the dishwasher cycle, it can be challenging to remove, and it might affect the cup's performance or cause mold growth.

6. Warranty Void: Using the dishwasher on cups labeled "hand wash only" or "not dishwasher safe" may void the manufacturer's warranty, leaving you without any recourse if the cup gets damaged.

To prolong the lifespan of your insulated cup and maintain its performance, it's best to follow the manufacturer's care instructions. Hand washing with mild soap and lukewarm water is generally the safest way to clean insulated cups. Avoid using harsh abrasives or metal scrubbers, as they can damage the cup's surfaces.

If you accidentally ran your insulated cup through the dishwasher and notice no immediate damage, it's still a good idea to switch to hand washing to preserve its functionality and appearance in the long term.