Do Dishwashers Dull Knives?

I have recently started using a dishwasher for most of my kitchen utensils and cutlery.

While I love how easy it makes getting clean dishes and cutlery, one thing I have noticed is that my kitchen knives look duller with every wash cycle in the dishwasher.

While initially, I did not think my dishwasher had anything to do with it, the more I washed my kitchen knives in the dishwasher, the more I started noticing the difference.

This made me wonder, should I stop washing my kitchen knives in the dishwasher, or is there a way to wash the knives in the dishwasher without making them look dull?

In this article, I will tell you all that you need to know about washing knives in dishwashers and the correct way to clean them without making them dull.

Do Dishwashers Dull Knives? 

Yes, dishwasher can dull knives. Over time, the intense cleaning cycles and harsh chemicals can cause the blades of your knives to dull. 

In fact, many experts warn against placing knives in the dishwasher altogether.

A dull knife doesn’t just mean inefficient cutting; it can also be dangerous, requiring more force and potentially leading to injuries.

Consider alternative methods for cleaning your knives, such as handwashing, to prolong their lifespan and prevent dulling.

There are several reasons why dishwashers can cause your knives to become dull, and it’s its important to understand the impact of using this method to clean your knives.

Also read: Can You Put Wooden Spoons in Dishwasher?

The Problems When You Put Knives in the Dishwasher

While dishwashers are useful for cleaning dishes, they can cause multiple problems for your knives, such as dulling, rust, and handle damage.

Let us explore the issues that arise when you put your knives in the dishwasher.

Dull Blade Due to Powerful Water Pressure

First, the powerful water spray in the dishwasher can cause the delicate edge of your knives to knock against other items. This repeated contact leads to a duller blade over time.

It’s important to be cautious when placing your knives in the dishwasher, as their sharpness is vital for their performance.

Furthermore, ceramic knives are more susceptible to damage in dishwashers due to their brittleness, which can result in chipping or snapping.

Wet Environment Causing Rust 

The dishwasher’s hot and moist environment can also contribute to the development of rust on your knives. Rust is not only a visual eyesore but also affects the knife’s performance. 

To avoid rust formation, be sure to thoroughly dry your knives immediately after washing, whether you hand wash them or use a dishwasher.

Also read: How to Get Rust Off Kitchen Knives

High heat Damaging the Handle

Another concern is the potential damage to the knife’s handle. 

Many knife handles are made of materials like wood or plastic, which can degrade or warp in a dishwasher’s high-heat and high-moisture environment. 

This can lead to a loose handle, making the knife difficult to use and potentially hazardous while cutting.

Harsh Detergents Causing Dull Knives

Furthermore, the strong detergents used in dishwashers can contribute to dulling your knives. 

The harsh chemicals can strip away the protective coating on your knives, causing them to lose their edge faster. 

When possible, opt for gentler soaps or detergents that are designed specifically for cleaning knives if you must use a dishwasher.

For more details, watch the video below:

Also read: Does Dishwasher Safe mean Microwave Safe?

Precautions While Placing Knives in the Dishwasher

Think about the type of knife you’re placing in the dishwasher. If it’s an expensive or delicate blade, consider hand-washing it to avoid damage. 

By taking the following precautions, you can maintain your knife’s sharpness, even when using a dishwasher for cleaning:

Place the Knives in Correct Position 

For dishwasher-safe knives, place them in a secure position on the rack. This can reduce the risk of the knife coming into contact with other items and getting dull or damaged. 

Make sure the blades are not touching each other or other utensils, as this can lead to chipping or dulling the edges.

Avoid placing knives in the bottom rack. The high-powered water jets and turbulence created by the dishwasher’s cleaning cycle can be too harsh for knife blades. 

It’s best to place them in the top rack, away from other utensils, where they will be subjected to milder water pressure.

Do not Use Excessive Dishwasher Detergent

Using too much detergent can cause a build-up on your knives, leading to dull and cloudy blades. 

Follow the recommended detergent amount for your dishwasher and read the labels on your dishwasher detergent to ensure you’re using the correct amount.

Pay Attention to Drying 

Do not let knives sit in the dishwasher after the cycle has ended, as moisture can lead to rusting or damage the handle.

Remove them promptly and dry them thoroughly with a towel.

Also read: Are Yeti Cups Dishwasher Safe?

How to Effectively Clean knives

Here is the correct way to go about cleaning your knives: 

  • First and foremost, it is recommended to hand wash your knives. Clean your knives using warm, soapy water. 
  • Gently scrub the blade with a soft sponge, being careful not to cut yourself. Wash the handle as well.
  • If the knife is dirty soak it in soapy solution or vinegar solution for sometime before washing. 
  • For stuck debris, use an old toothbrush to scrub it away.
  • After washing the knives, dry them thoroughly using a clean towel/dish cloth
  • Keeping your knives dry is crucial to prevent rust and corrosion, which can form more quickly on damp knives. Be sure to dry the blade immediately after washing to avoid any water spots on the steel.
Also read: 10 Things You Must Never Wash in Dishwasher

How to Properly Store Knives 

When it comes to storing your knives, you have a few options to choose from.

Regardless of your chosen storage method, it’s important to keep knives away from moisture. 

This helps prevent rust and corrosion, ensuring your knives stay sharp and usable for a longer period.

One popular choice is a knife block. A knife block keeps your knives organized and protects them from damage. 

It also helps to minimize moisture, which can cause rust or dullness if not properly addressed.

In addition to knife blocks, magnetic strips are another efficient storage method. They make it easy to access your knives, while still keeping them protected from potential damage. 

When using a magnetic strip, ensure that you gently place the knife on the strip, being careful not to scratch or damage the blade.

Drawer knife organizers are also a good choice because they protect your knives from being jumbled together, which can cause damage. 

When using drawer organizers, make sure there is enough space between knives so they don’t accidentally bump into one another.

Also read: Can Oven Mitts Be Washed (Washing Machine, Dishwasher, Dryer)?

Different Types of Knives and Their Dishwasher Compatibility

Allow me to tell you about some common knife materials and whether they are safe to go in the dishwasher.

Stainless Steel Knives

It’s important to note that putting your stainless steel knives in the dishwasher can lead to some negative effects. 

The harsh chemicals in detergents, as well as the high heat and water pressure, can cause stainless steel blades to dull and become damaged over time. 

To maintain the longevity and performance of your stainless steel knives, it’s recommended to hand wash and dry them instead.

Carbon Steel Knives

Carbon steel knives are known for their sharpness and ability to hold an edge. However, these knives also require extra care due to the reactive nature of carbon steel. 

Exposure to water and other metals can lead to staining, dulling, and rusting. This makes dishwashers a less-than-ideal cleaning method for this type of knife. 

Handwashing and drying your carbon steel knife immediately after use is the best strategy for preserving its sharpness and overall quality.

Ceramic Knives

Ceramic knives offer a lightweight, non-reactive option for cutting tasks in the kitchen. However, their unique properties also make them less suitable for dishwasher cleaning. 

The high heat and water pressure in a dishwasher can potentially damage the brittle ceramic material, leading to chipping and cracking. 

Additionally, contact with other items in the dishwasher can further increase the risk of damage to the knife’s edge. 

To maintain sharpness of your ceramic knives, it’s best to stick to handwashing and thorough drying before storing them safely.

Other Factors That May Damage Your Knives

In addition to dishwashers having a dulling effect on knives, there are other factors that can also cause damage to your blades: 

Wrong Cutting Surface

When using knives, it’s essential to be mindful of the surfaces on which you cut. A hard cutting board, like one made from glass or ceramic, can easily cause nicks and dents in your knife’s blade. 

Opt for wooden or plastic cutting boards, as they are gentler on your knives’ edges.

Storing the Knives Improperly

The way you store your knives can also affect their longevity. Keeping knives loose in a drawer may lead to the blades striking one another, causing damage to the edges. 

To protect your knives, store them in a knife block or on a magnetic knife strip. This will keep them separated from other utensils and maintain their sharpness.

Using Electric Sharpners

Avoid using electric sharpeners, as they can be too harsh on your knife edges.You can use sharpening stones, honing rods, or professional sharpening services. 

Regularly sharpen your knives to maintain their edge and performance. 

Wrong Cutting Technique

When cutting, avoid dragging the knife edge across the cutting board, as it can wear down the edge. Instead, use a rocking or slicing motion to preserve the sharpness.

Frequently Asked Questions

Here are some frequently asked questions: 

Are Chef Knives Dishwasher Safe?

No, chef knives are not dishwasher safe. Putting chef knives in the dishwasher can lead to rust, corrosion, and even warping due to the heat and humidity. It is best to hand wash your chef knives to maintain their sharpness and longevity.

Is it Safe to Use a Knife Rack in the Dishwasher?

Using a knife rack in the dishwasher can help prevent knives from moving around during the wash cycle. However, it is still not recommended to put your sharp knives in the dishwasher. Hand washing is the best care to ensure your knives maintain their sharpness and quality.

Can Wusthof Knives Go in the Dishwasher?

Although many Wusthof knives are technically dishwasher safe, it is still not recommended to put them in the dishwasher. Hand-washing Wusthof knives will prevent damage to the blades and ensure they stay sharp and in good condition

How to Sharpen Dull Knives?

To sharpen dull knives, you can use a knife sharpener, a honing rod, or a whetstone. Always follow the manufacturer’s instructions for sharpening, maintaining the correct angle, and applying even pressure.

Why Does my Knife Have Rust Spots After Placing it in the Dishwasher?

Rust spots can form on knives after being placed in the dishwasher due to the high heat and humidity. This environment can cause oxidation or damage to the knife’s finish source. To prevent rust spots, it is best to hand wash and dry your knives immediately after use

How Can I Make Dull Knives Useful in the Kitchen?

Dull knives can still be useful in the kitchen for tasks like cutting soft fruits, peeling vegetables, or spreading butter. 
However, it is always best to maintain sharp knives for efficient and safe food preparation


Now you are aware that putting your knives in the dishwasher does indeed dull them. 

This is due to the powerful water cycles that can knock your knives around during the wash, causing damage to their fine blade edges. 

Additionally, the strong detergents used in dishwashers contribute to the dulling of your knives, as well as heighten the risk of rust and corrosion.

To maintain the sharpness of your knives and prolong their lifespan, it is advisable to clean them by hand washing. 

Be gentle with your knives, and avoid soaking them in water for prolonged periods, as this can also make them more susceptible to rust and corrosion.

When washing your knives by hand, make sure to use a mild detergent that is specifically designed for cleaning cutlery. 

After washing, carefully dry the knives using a soft towel to prevent moisture from remaining on the blade, which can lead to rust. 

Finally, store your knives properly in a knife block or on a magnetic strip, ensuring that the blades do not come into contact with other utensils.

While dishwashers may seem like a convenient way to clean your knives, the potential damage to their sharpness and quality makes hand washing a better option. 

By adopting the proper cleaning technique, enjoy slicing, chopping, and cutting your food away!

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I’m Jueria and I am a regular contributor on In my articles, I share time-saving techniques, appliance wizardry, and health-friendly recipes to bring taste and wellness to your table. So raise a glass (or a spatula) with me, to good health and good food, made easy!