Why Good Knives Don't Belong in the Dishwasher
Heat, aggressive detergents and contact with other cutlery – why the dishwasher damages quality knives and how to clean them properly.
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What Happens to a Knife in the Dishwasher
In the dishwasher, high temperatures, aggressive detergent salts and prolonged moisture all act on the knife at once. This attacks the edge, encourages staining and corrosion, and even rust-resistant steels suffer over time. Knocking against other cutlery or crockery damages the fine blade as well.
Especially Vulnerable: Wooden Handles and Carbon Steel
Wooden handles swell in the wet, then dry out and crack, and can work loose. Carbon steel blades are not stainless and react particularly quickly with surface rust in the dishwasher. For both, hand washing is a must, not a nicety.
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How to Clean Knives Properly
Wash the knife by hand straight after use with warm water and mild washing-up liquid, wipe it carefully with a cloth – away from the edge – and dry it thoroughly at once. That keeps blade and handle looking good and working well for a long time.
If It Does Happen Once
A single cycle rarely ruins a good knife outright, but it should stay the exception. Dry the blade well afterwards and re-oil a wooden handle if needed to prevent moisture damage.
Frequently Asked Questions About Cleaning Knives
Can stainless knives go in the dishwasher?
Stainless blades also suffer from heat and detergent salts. Hand washing is far gentler on sharpness and material.
Why does the dishwasher damage a wooden handle?
The moisture makes the wood swell and later dry out and crack – the handle can work loose or splinter.
What is the best way to clean knives?
By hand with warm water and mild washing-up liquid, then dry immediately.
What can I do about surface rust on the blade?
Remove light surface rust carefully with a mild polishing compound or a cork block, then keep the blade dry.
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