How To Get Rust Off A Knife?

Do you have a favorite knife that has become rusted and don’t know how to fix it? Whether you use it for slicing vegetables or cutting meat in the kitchen, removing rust can prolong a blade’s lifespan. In this guide, Seki will tell you how to get rust off a knife and restore it to its former glory. 

What Is Rust? 

Rust is a form of corrosion that occurs when metals (iron or steel) react with water or acidic substances for a long time.

When a knife is stored in a damp environment or is used to cut food with a high acid content, it can develop rust.

Rust can ruin a knife’s appearance and affect its functionality. The rust weakens the blade’s metal, making it more prone to damage and causing it to become pitted.

When the knife is rusty, you will find it difficult to cut food. Thus, you should remove rust from the blade as soon as possible to prevent further damage and maintain its quality.

How To Remove Rust From Knives? 

With Baking Soda

  • Step 1: Mix baking soda and water in a small bowl until you get a thick consistency.
  • Step 2: Apply the mixture to the rusted spots of the knife, using a soft-bristled toothbrush or cloth to rub it gently. Use a scouring pad for severe rust.
  • Step 3: Let the paste sit on the rusted areas for around one hour.
  • Step 4: Rinse the knife under water to get rid of all of the baking soda paste.
  • Step 5: Dry the knife thoroughly with a clean towel or cloth.
  • Step 6: Apply a thin layer of oil (such as camellia oil) to the blade to prevent future rusting.

With Lemon Juice

  • Step 1: Apply a salt layer on the knife’s rusted parts.
  • Step 2: Squeeze enough lemon juice to completely submerge the rusted knife in a container. Let the knife soak in the lemon juice for at least 2 hours or up to several hours for severe rust.
  • Step 3: Remove the knife from the lemon juice and use a toothbrush or soft sponge to scrub away any remaining rust.
  • Step 4: Rinse the knife with clean water and dry it.
  • Step 5: Apply a thin layer of vegetable oil or beeswax to the blade to prevent rusting.

With Vinegar

  • Step 1: Fill a glass/ small container with enough white vinegar to completely submerge the rusted knife.
  • Step 2: Soak the knife in the vinegar for at least 30 minutes or overnight for a more damaged knife.
  • Step 3: Take the knife from the vinegar glass and use a wire brush or steel wool to remove the remaining debris.
  • Step 4: Use soap and water to clean the knife and wipe it with a clean towel.
  • Step 5: If the rust spots remain, repeat the above procedure.

Other Methods

  • Potato: Cut a potato in half and sprinkle baking soda or salt on the cut side. Rub the potato over the rusted areas of the knife until the rust is removed.
  • WD-40: WD-40 is a versatile product that can be used as a lubricant, cleaner, and rust remover. Spray it onto the rusted areas of the knife and let it sit for a few minutes. Use sandpaper to scrub away the rust.
  • Coca-Cola: Pour some Coca-Cola into a container and soak the rusted knife in it for a few hours. The acid in the cola will help to dissolve the rust. After soaking, rinse the knife and let it dry.
  • Onions: Cut an onion in half and use one half to rub the blade until the rusted areas completely disappear. Rinse the knife with water to remove any remaining rust and onion.

Tip And Tricks

It’s best to prevent your knives from being rusted. You can refer to some tips below:

  • After using your knives, wash and dry them thoroughly with a towel before storing them. It will prevent moisture from accumulating on the blade and causing rust.
  • Avoid exposing your knives to acidic substances, such as citrus fruits, vinegar, or dishwashing liquid for a long time.
  • Sharpen your knives after removing the rust to maintain the sharpness and make the blades look new.
  • Apply a small amount of oil to your stainless steel knives two or three times a year. It helps keep the knives lubricated, preventing any potential damage or wear over time.
  • If you want to use cleaning products, avoid using cleaners that contain chloride, as they can be harsh and cause damage to the protective layer of chrome oxide on the blade. 
  • Avoid putting your knives near cast iron products because they can cause a reaction with the metal in your knife. It can lead to discoloration or even rusting.

FAQs relate to topic Get Rust Off A Knife

Can You Sharpen Rust Off A Knife?

No. It’ll take a lot of effort to sharpen rust off a knife, and you may end up removing too much metal, which can shorten the blade’s lifespan. 

It would help if you only sharpened it after removing all rusted spots to make the knife look newer.

Why Are My Knives Rusting?

A knife will be rusted if exposed to acid, wet for a long time after use, or stored in a damp environment.

Among them, the most common cause is exposure to salt. If you use your knives to cut foods that are high in salt content and don’t clean it carefully, your blade will quickly rust.

What Is The Best Tool To Remove Rust From Steel?

A wire brush is the best tool for removing light to moderate rust from steel. It’s available in different sizes and shapes and can be used to remove most rust from small or large steel objects.

Will Olive Oil Prevent Rust On Knives?

Yes. Olive oil has some natural protective properties that can help prevent moisture from reaching the blade’s surface, which can help prevent rust. However, you should apply a moderate amount to avoid attracting dust and dirt.


How to get rust off a knife? You can use baking soda, WD-40 solutions, Coca-Cola, or natural methods such as lemon juice, vinegar, potatoes, or onions. Remember to clean the blades after completely removing the rusted areas and apply a thin layer of oil to prevent the knives from rusting in the long run.