Kitchen specialists have issued a stark warning against placing sharp knives in the dishwasher, a common mistake that can ruin their effectiveness and pose safety risks. According to Appliance City, knives should never be loaded into the dishwasher, as the process can cause them to become blunt, rust, or even become unusable.
Why Dishwashers Damage Knives
Appliance City explained on its website: 'You might be wondering where your sharp knives should go in your dishwasher. The truth is that they should be completely avoided when it comes to loading your dishwasher.' The company emphasised that knives collect bacteria, making proper cleaning essential for food safety, but soaking blades or using a dishwasher is not the answer. Instead, they recommend handwashing knives immediately after use.
Tableware specialists Villeroy & Boch concur, adding that repeated dishwasher use can cause knives to become blunt over time. 'In the worst case scenario, they may even rust and become unusable. This is because both the handles and blades are affected,' the company stated.
Safety and Hygiene Concerns
Sharp knives in the dishwasher also present a danger to users. Appliance City noted: 'Never point them upwards in the silverware basket, as this can lead to serious injury. It is always best to handwash your knives for safety and hygiene.' The detergents used in dishwashers contain salts that contribute to corrosion, accelerating wear and tear on knife blades.
Villeroy & Boch warned that premium knives placed in the dishwasher 'probably won't have your beautiful cutting tools for long,' adding: 'Although the damage is always not immediately visible, repeated wash cycles will, over time, make your knives blunt.' They advise against cleaning high-quality knives—such as steak, meat, bread, and serving knives—in the dishwasher.
Exceptions and Best Practices
While some basic kitchen, dinner, and ceramic knives may be dishwasher-safe, Villeroy & Boch recommend careful arrangement to avoid contact with other cutlery or crockery that could cause damage. They suggest placing knives in the cutlery drawer alongside other items, or using the cutlery basket with blades facing downward to minimise injury risk. However, opinions differ on the best orientation, as blades facing up may clean more effectively but pose a hazard during unloading.
The UK kitchen knife market is valued at approximately £150 million to £200 million, with 3.5 million to 5 million knives and knife blocks purchased annually. Investing in quality knives means proper care is essential to extend their lifespan and maintain performance.
