1) Removing Rust with White Vinegar
White vinegar is a natural cleaning agent containing acetic acid, which helps dissolve minerals that cause oxidation and effectively removes rust from knife blades in a safe way. In addition, white vinegar can deodorize and disinfect, keeping the knife clean and hygienic.

You can do the following:

• Step 1: Soak the knife in white vinegar for about 5–10 minutes for light rust or 3–5 hours for heavy, long-lasting rust.

• Step 2: Use a soft cloth or a small brush to gently scrub the blade.

• Step 3: Rinse the knife with water and dry it with a clean cloth.

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2) Removing Rust with Fresh Lemon and Salt
Fresh lemon and salt both have mild acidity that helps dissolve minerals causing oxidation, effectively removing rust. They also have disinfecting and deodorizing properties, eliminating harmful bacteria and keeping the knife hygienic.

How to do it:

• Step 1: Cut a lemon in half, sprinkle some salt on it, and rub it over the blade.

• Step 2: Use a soft cloth or a small brush to scrub away the rust.

• Step 3: Rinse the blade with clean water and dry it with a clean cloth.

Note: Perform this process carefully to avoid damaging the blade or injuring your skin. Ensure the knife is completely dry before use to prevent oxidation or rust from returning.

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3) Removing Rust with Baking Soda
Baking soda is a natural cleaner with mild alkalinity. When mixed with water, it creates a paste that can break down the chemical bonds of rust, making the blade look shiny and new again. It also has mild abrasive properties that won’t scratch the knife surface, and it helps eliminate odors and bacteria.

How to do it:

• Step 1: Mix 1–2 teaspoons of baking soda with a little water to form a paste.

• Step 2: Apply the paste to the rusty areas and let it sit for about 5 minutes so the baking soda can work and dissolve the rust.

• Step 3: Use a sponge or soft brush to gently scrub the blade. Add a bit of water if needed to help the cleaner adhere better.

• Step 4: Rinse the blade with clean water and dry it with a clean cloth.

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4) Removing Rust with Onion and Salt
Onions contain sulfur compounds with mild acidity that help remove rust and other stains from the blade. Salt is also a natural cleaning agent that helps lift grime. Additionally, onions deodorize and provide antibacterial benefits.

How to do it:

• Step 1: Puree an onion and mix it with salt.

• Step 2: Apply the mixture onto the blade and let it sit for about 10 minutes to allow the compounds to break down the rust.

• Step 3: Use a sponge or soft brush to gently scrub the blade.

• Step 4: Rinse the blade with clean water and dry it with a clean cloth.

You can also simply cut an onion in half and rub it directly on lightly rusted spots for immediate results.

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5) Removing Rust with Rice Water
Rice water contains mild acidic components that help remove rust and stains from knife surfaces.

How to do it:

• Step 1: Soak the knife in rice water for a few hours.

• Step 2: Use a soft cloth or small brush to scrub off the rust.

• Step 3: Rinse the blade with clean water and dry it with a clean cloth.