Methods and means for successfully derusting knives

There is a wide choice of methods and means to rust knives. First and foremost, it should be decided which effort is appropriate. The condition of the blade, which can range from flying stanchions to substantial pitting, plays a decisive role. Often, derusting can be combined with sharpening.

Cola and potatoes

When a knife has set rust, the owner often first thinks of classical removal methods such as grinding or polishing. However, there are a number of so-called home remedies that develop amazingly good at de-rusting. Often, they develop their effect through pure action and require only a small amount of force, which is similar to wiping.

Two typical and effective home remedies are potatoes and coke. In the raw potatoes, oxalic acid contained in it acts on the rust. In Cola, aggressive ingredients of the recipe kept secret by the manufacturer are helpful. For both remedies, lasting several hours is the key to success. The blade of a knife can either be easily inserted into a potato of sufficient size or placed in a container of potato chips. Pure Cola helps as a soaking bath for the entire knife.

After a contact time of at least twelve hours, the loosened rust can usually be easily removed with a cloth or a brush. Microfibre cloths help additionally.

acid baths

In general, household acids such as vinegar essence, limonene or citric acid are also useful as rust remover. The knife is also soaked. Here are usually a few hours. However, it must be checked whether the handles and attachment points of the blade withstand the particular acid.

abrasive pastes

For mechanical rust removal by grinding, even mixed grinding pastes are recommended. This method is particularly suitable for higher quality knives and heirlooms with ideal value. As a paste base, baking soda, tartar, hydrogen peroxide can be used, which are processed with water to a toothpaste-like consistency.


Of course, the rust on smooth blades of a knife can also be ground down. For this grain sizes between 120 and 400 are recommended, always starting with the coarsest grit.

Tips & Tricks

Never combine the different active or home remedies. When they meet, they can undergo unwanted chemical reactions that can be detrimental to health or destructive.

Video Board: Rust removal