How to clean a knife blade?

Daily care of a knife blade

To ensure the long life of your kitchen knives, regular cleaning after each use is essential.

Here are the best practices to follow:

1- Cleaning by hand:

• Always wash by hand using lukewarm water and mild soap.
• Avoid the dishwasher as it can damage :
  – the cutting edge due to impacts in the dishwasher,
  – the blade and handle due to aggressive chemicals and excessive heat.
• Use a non-abrasive sponge to avoid scratching the surface of the blade and creating brittleness in the steel which could, over time, become rust spots.
• For stubborn residues, leave the blade to soak for a few minutes in hot water and use a soft brush if necessary. Abrasive items can scratch your blade, and scratches encourage oxidation.

2- Drying:

• Once cleaned, wipe the kitchen knife immediately with a clean, soft, dry cloth to prevent water stains or rust from forming.
• Avoid leaving the knife to dry in the open air. Drops of water will leave deposits that damage the steel and make it brittle.
• If your knife has a wooden handle, take care to avoid contact with liquids as much as possible, and for as long as possible. Always dry the handle thoroughly.

3- Storage:

• Store your knives in an appropriate holder, such as a knife block, magnetic bar, case, sheath or blade guard.

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How do you clean a rusty blade or get rid of rust stains?

Here are some effective ways of removing rust:

Rub the blade with a potato or onion!

Economical and natural, this may seem a strange solution, but it’s effective for removing light, superficial traces of rust. Peel and rinse your potato or onion so that there’s no risk of remaining a speck of dirt. Cut in half and rub your blade.

If your kitchen knife blade has a matt finish, you can go a step further by adding a little salt or bicarbonate of soda to your blade to make it more abrasive. Be careful, as salt or bicarbonate can scratch shiny blades.
Rinse and dry your blade with a soft cloth.

Create a homemade rust remover

This solution, which is also easy to use and effective against light traces of rust, consists of polishing your kitchen knife blade, which has been coated with cleansing milk, with a cork, as if you wanted to erase or rub it out.
Rinse with hot water to remove the grease and wipe with a soft cloth.

Cure evil with evil: lemon juice

You can combat stubborn rust stains with lemon juice.
The acidity of the lemon will dissolve the rust deposits and remove the stains.
Apply drops of pure lemon juice to the rust stains and leave for 2 to 3 minutes. Rub with a soft cloth, rinse and dry the blade with a soft cloth.

Heating white vinegar

Like lemon, white vinegar will help you to get rid of rusty blades where oxidation is important.
Heat the vinegar slightly and apply it with a cloth to the blade of your knife. Rub it in.
You can also soak your blade (not the handle!) in hot vinegar mixed with sodium bicarbonate (it foams!). Keep an eye on it regularly, wiping off any spots of rust. When the rust has completely dissolved, rinse your blade in clean water and dry.

The old-fashioned way with turpentine

Useful when the rust is really bad, turpentine will allow you to work hard.
Rub your blade with a soft cloth soaked in turpentine. Rinse with soapy water and dry.

Maintaining a carbon steel blade

Carbon steel knives are appreciated for their exceptional sharpness, but they are more susceptible to rust than stainless steels. They also dislike water and acidic foods.

Here’s how to look after them:

1- Clean immediately by hand:

Clean with soapy water and a soft sponge, and wipe your blade immediately and imperatively after each use to avoid the appearance of corrosion.

When used, carbon steel will change colour, turning into black. This is a normal reaction that ‘marks’ carbon blades (see below).

Never put a carbon steel blade in the dishwasher.

2- Applying a protective layer:

To protect your carbon blades, you can regularly apply a thin layer of edible mineral oil to the blade. This will create a barrier against moisture.

3 – Polishing :

For small rust stains, try the potato, onion or homemade eraser techniques. Avoid using lemon and vinegar, which can eat away at your blade!

4 – Natural patina:

Allow the blade to develop a natural patina with use. This thin layer of oxidation will protect the carbon steel from deeper rust.

Maintaining a damascus blade

Cleaning a Damascus steel blade requires care and attention to preserve its appearance and properties.

Here are the steps to follow to clean a Damascus steel blade:

1- Initial rinsing :

Run the blade under warm water to remove surface dirt. Avoid hot water, which could damage the steel or finish.

2- Gentle cleaning:

Apply a small amount of mild soap to a soft cloth or non-abrasive sponge.

Gently rub the blade.

3- Rinse:

Rinse thoroughly to remove any soap residue. Make sure no traces remain, as soaps can dull the characteristic damascus pattern.

4- Dry immediately:

Use a clean, dry cloth to wipe the blade immediately. This will prevent the appearance of stains or rust.
Then leave the blade in the open air for a few minutes to dry completely.

5- Pattern maintenance and rust protection :

If the blade looks dull, apply a drop of oil with a soft cloth. Spread evenly to revive the pattern and protect the steel.
For more thorough maintenance, you can use a specific product designed for damascus steel.

6- Avoid aggressive products:

Never use corrosive chemicals, abrasives or wire wool, which could damage the blade or its pattern.

Additional advice
for optimum maintenance
of your blades

Use:

Avoid using your knives on hard surfaces such as stone or glass, which can dull the blade.

Sharpening:

Regularly hone or sharpen your knives with a ‘sharpening’ tool suited to their steel types and the condition of their cutting edges.

Inspection:

Regularly examine your blades for signs of wear or corrosion and act quickly.

Cleaning and maintaining a knife blade isn’t just about hygiene: it’s also a way of extending the life and effectiveness of your knife. Whether you’re dealing with stainless steel, carbon or damascus knives, each type of blade requires specific attention. By following this advice, your knives will continue to perform and look good for years to come.

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