A key accompanies us daily – in the trouser pocket, handbag or on the key ring. Over time, moisture, dirt or improper storage can cause rust to form on the key. That not only looks unsightly but can also impair its function.
Luckily, light surface rust can usually be removed without problems. In this guide you'll learn how to clean rusty keys, which home remedies help and how to prevent rust in the future.
Why does a key rust?
Many keys are made of steel or steel alloys with a protective coating. If this coating is damaged or the key frequently comes into contact with moisture, rust can form.
Common causes are:
- Moisture in jacket or trouser pockets
- Storage in a damp basement or garage
- Contact with salt water
- damaged protective coating
- prolonged disuse
Older keys in particular can be more prone to rust.
Removing light rust from the key
For superficial rust, simple home remedies are often sufficient.
Cleaning with cola
A tried-and-true household tip is cola. The phosphoric acid it contains can help loosen light rust deposits.
How it works:
- Place the key in a glass of cola for a few hours.
- Then clean it with a soft brush or an old toothbrush.
- Rinse with clean water.
- Dry thoroughly immediately.
Important: Deny not forget the key in the liquid overnight, as sticky residues can form.
Turpentine or paraffin oil
You will need:
- the rusty keys
- a container
- Paraffin or turpentine oil
Instructions:
Place the keys in a container with Paraffin or turpentine oil and let them soak overnight. The next day, you can easily wipe off the rust with a clean cloth.
Vinegar
Place the keys in a bowl of vinegar overnight. Afterwards wipe the key with kitchen paper. Extra tip: use a toothpick to remove rust from decorations or engravings. Vinegar is also well suited for removing surface rust.
Application:
- Soak the key in household vinegar for about 30 to 60 minutes.
- Clean with a soft brush.
- Rinse well with water.
- Then dry completely.
For stubborn rust, the process can be repeated.
Lemon juice and salt
The combination of citric acid and salt also helps against light rust spots.
How it works:
- Sprinkle a little salt on the key.
- Drizzle with lemon juice.
- Let sit for about 30 minutes.
- Clean with a toothbrush.
- Rinse well and dry.
Removing stubborn rust
If the rust is already more pronounced, finer tools may be necessary.
Suitable options are:
- fine brass brushes
- very fine steel wool (0000)
- rust eraser
When doing this, you should work carefully to avoid unnecessarily damaging the surface of the key.
Protect the key after cleaning
After removing rust, a light protective film is recommended.
Suitable options include:
- a little sewing machine oil
- silicone spray
- special metal care oil
One drop is enough. Then remove the excess with a soft cloth.
Prevent rust in the door lock
Not only the key, but also the lock itself should be maintained.
Suitable maintenance options include:
- graphite powder
- special lock care products
Regular cooking oil or thick greases are unsuitable, as they attract dirt and can cause the lock to gum up over time.
How to prevent rust on the key
With a few measures your key will remain rust-free for a long time:
- Dry the key immediately after contact with water.
- Do not keep it permanently in damp jacket pockets.
- Clean after working outdoors.
- Occasionally wipe with a soft cloth.
- Keep dry during long-term storage.
When should a key be replaced?
Replacement is advisable if:
- the key is heavily rusted,
- the key's teeth or edges are damaged,
- the key can only be inserted into the lock with difficulty,
- cracks in the metal are visible.
A damaged key can, in the worst case, break off in the lock.
Frequently asked questions about rusty keys
Can cola really remove rust?
Yes. The phosphoric acid it contains can remove light surface rust. Afterwards the key should, however, be thoroughly cleaned and dried.
Is vinegar better than cola?
Both methods work for light rust. Vinegar usually works a little faster and does not leave sticky residues.
Can a rusty key damage the lock?
Light surface rust is usually unproblematic. Heavy rust or rust particles can, however, contaminate the lock in the long term or impair the locking mechanism.
Can I oil the key?
Yes, but only sparingly and with suitable metal care oils. For the lock itself, graphite powder or a special lock care product is recommended.
Conclusion
Rust on the key can be removed in most cases with simple household remedies such as cola, vinegar or lemon juice. It is important to thoroughly dry the key after cleaning and apply a thin protective film. This keeps it operating smoothly and rust-free.
With regular care and dry storage you can prevent new rust from forming and your key will work reliably for many years.
Image by Janine, meinhaushalt.at
Read also: No more rusty knives
