How to Remove Rust From Knife Blade? | 5 Cheap Methods

Knife allows us to speed up the ingredients-cutting process. But sometimes they get rusted and cause irritation. If this happens to you, then after this guide you’ll be able to use it again like a new one. Here I’m explaining my favorite process of how to remove rust from knife blade?

So, let’s find out the reasons and steps:

Real Culprits Behind Knife Rusting | Common Reasons

Below are some of the common reasons of knife rusting:

Knife Rusting Common Reasons | How to Remove Rust From Knife Blade
Air, Moisture & Bad Storage Causes Knife Blade to Rust Quickly
  • Air & Water

It’s simple science: your knife meets oxygen and moisture, and bam! Rust starts forming. Moisture is the main villain here, speeding up this unwanted reaction.

  • Not All Steel is Created Equal

Those high-carbon steel knives?

Super sharp, but they’re rust magnets. They lack chromium – stainless steel’s secret weapon against rust.

  • Acidic Foods

Love slicing lemons or dicing tomatoes? Your knife might not. Acidic foods can strip away the blade’s protective layer, leaving it vulnerable.

  • Cleaning Mishaps

Dishwashers and knives? Not the best friends. The mix of heat, moisture, and detergents is a recipe for rust. And let’s not forget: a wet knife left out is like a welcome sign for rust.

  • Storage Woes

Storing knives in damp or cramped spaces? That’s a no-go. Moisture and poor air circulation are the perfect storm for rust formation.

  • Salty Situations

Knives near the sea or used with salty foods face a tougher battle against rust. Salt accelerates corrosion, making it harder for your knife to stay pristine.

  • Metal Mix-up

Knives touching other metals can also spell trouble. This odd couple can kick-start corrosion, especially when water joins the party.

How to Remove Rust From Knife Blade? | 5 Authentic Ways

How to Remove Rust From Knife Blade 5 common ways

Below are the 5 common ways on how to clean rust off knife. Even if you haven’t tried them before still you will learn how to remove rust from knife blade? These are mentioned sequentially by cost & ease of accessibility.

1. Lemon Method

First of all, we have this inexpensive but effective method. Lemon juice is acidic, which helps break down rust naturally. Here’s how to remove rust from a knife blade:

Step 1: Cut a fresh lemon in half.

Step 2: Rub the cut side of the lemon over the rusted areas of the blade.

Step 3: Let the lemon juice sit on the blade for a few minutes.

Step 4: Scrub the blade gently with a sponge or cloth.

Step 5: Rinse with water and dry the knife thoroughly.

2. Vinegar Method

Secondly, vinegar’s acetic acid is excellent for dissolving rust without damaging the blade.

Step 1: Pour white vinegar into a glass or plastic container.

Step 2: Submerge the rusted part of the knife in the vinegar.

Step 3: Leave the knife in the vinegar for 1 to 5 hours, depending on the rust severity.

Step 4: Remove the knife and scrub with a sponge or brush.

Step 5: Rinse and dry the knife completely.

3. Potato Method

Got shocked? Yes, I got too when I tried it the first time! Since potatoes contain oxalic acid, which reacts with rust. So, it makes it easier to remove.

Step 1: Cut a potato in half.

Step 2: Insert the blade into the potato, ensuring contact with the rusted areas.

Step 3: Leave the knife in the potato for several hours or overnight.

Step 4: Remove and scrub off the loosened rust.

Step 5: Rinse and dry the knife.

4. Baking Soda Method

This is one of the most famous methods to remove rust from metal items. Baking soda is mildly abrasive, which helps in scrubbing away rust without scratching the blade.

Isn’t it?

But this you’re here to remove the rust from your kitchen knife:

Step 1: Mix baking soda with water to create a thick paste.

Step 2: Apply the paste to the rusted areas of the knife.

Step 3: Let it sit for a couple of hours.

Step 4: Scrub gently with a sponge or brush.

Step 5: Rinse and thoroughly dry the knife.

5. WD-40 & Sandpaper Method

Lastly, many car owners and cleaning enthusiasts will be familiar with this chemical. It’s a trendy item to remove stubborn rust & old smudges from steel and metal items. WD-40 helps in loosening the rust, and sandpaper effectively removes it. Here’s how to use it for culinary cleaning:

Step 1: Spray WD-40 on the rusted areas of the knife.

Step 2: Let it sit for a few minutes.

Step 3: Use fine-grit sandpaper to sand the rust off gently. Be temperate to avoid scratches.

Step 4: Wipe the blade with a clean cloth.

Step 5: Rinse and dry the knife completely.

How to Keep Your Knives From Rusting? | 3 Tips to Expand Knife Lifespan

It’s a common observation that knives get rusted even after cleaning. Try these tips to avoid rusting again. 

Dry Knives Immediately

  • Wash by hand
  • Dry with a towel right away

Store Properly

  • Use a dry, airy spot
  • Try knife blocks or magnetic strips

Oil Regularly

  • Use food-safe mineral oil
  • Apply on the blade lightly

The Bottom Line

All in all, now you’re equipped with the right information on how to remove rust from knife blade. There are different ways to perform the same thing. Yet, I recommend using the method that suits you best. As well as go for the one which requires minimal cost and material.

Tell me your experience of cleaning the rust from your favorite knife in the comment section.

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