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Why Do Microwave Ovens Rust Inside (How To Stop)

A microwave oven is a common kitchen appliance. From homes to hostels, restaurants to offices, this appliance has found its way into almost every kitchen. But have you ever noticed your microwave oven rusting due to constant usage?

You will find rust in the microwave oven, especially in the shared kitchen. The thing is, most people do not know how to clean or maintain it. As a result, the microwave ovens get rusty from the inside.

But that is not the only reason. There are several other reasons for the formation of rust inside microwaves. This article explains why microwave ovens rust inside and how to stop it.

Why Do Microwave Ovens Rust Inside?

Table of Contents,

Here are some common reasons for rusting inside a microwave oven.

Humidity Factor

Moisture is the main cause of rust. When you cook food inside the oven, the moisture inside the food is released and forms condensation on the surface of the oven. This condensation can cause rust to form on the surface.

Improper Maintenance

Have you ever stayed at a hostel? In the hostel, you experience the oven rusting inside. The biggest issues are poor maintenance and carelessness when using the oven. Usually, If you don’t clean the oven regularly, leftover food, grease, and water start to break down. If these substances are not cleaned off of metal surfaces, they will eventually cause the metal to rust.

Metal Type

The type of metal that your oven is made from can also affect how susceptible it is to rusting. For example, cast iron is more likely to rust than stainless steel.

Chemical Reactions

Another factor that can cause rust to form on the surface of your oven is chemical reactions. When certain chemicals come into contact with each other, they can cause a reaction that creates rust.


The older your oven is, the more likely it is to rust. This is because the metal surface can start to wear down over time, making it more susceptible to rust.

Leaving Food in the Microwave:

You might not think that leaving food in the microwave could cause rust, but it can. When food is left in the microwave, it can start to break down and form rust.

Wrong Cleaning Methods:

You should never use harsh chemicals or abrasive scrubbers to clean the surface of your oven. These can cause the metal to become weak and more susceptible to rust.

How Does Rust Form Inside A Microwave Oven?

Oven Rust

Rust forms when iron reacts with oxygen in the presence of water. This reaction is called oxidation. Water speeds the reaction between iron and oxygen, causing oxidation to occur more quickly in moist environments. That’s why you’re more likely to see rust on objects that are kept moist.

How Does Rusting Happen Inside Your Microwave Oven?

Rusting is accelerated by warm temperatures, so when you heat food in your microwave, the water molecules inside the food start to vibrate. These vibrations cause the water molecules to bump into each other and create friction. The friction creates heat, which cooks the food.

But sometimes, these water molecules can also bump into the metal walls of your microwave oven. When this happens, it causes tiny bits of metal to flake off the surface of the oven. These metal flakes can then mix with the water vapors inside the oven and create rust.

Over time, this rust can build up on the walls of your microwave and cause problems. It can make the oven less efficient, and it can also cause the food to taste metallic. Therefore, if you notice rust in your microwave, it’s important to clean it as soon as possible.

Dangers of Rusting inside the oven, Why is it necessary to prevent it?

If your oven is starting to rust on the inside, it’s important to take action to prevent the problem from getting worse. Rusting can cause serious damage to your oven and make it unsafe to use. Here’s what you need to know about the dangers of rusting inside an oven and how to prevent it.

Dangers of Rusting inside the oven:

Rust can cause serious damage to your oven and make it unsafe to use. When rust forms on the inside of an oven, it can weaken the structure of the appliance and lead to leaks. The paint on the oven begins to chip. The oven seems unsightly, and its walls peel. Rust can also cause problems with the electrical components of your oven, making it a fire hazard.

Why It Is Necessary To Prevent:

  • Preventing rust inside your oven is important for both safety and functionality. Rust can cause serious damage to the appliance and make it unsafe to use. It can also lead to electrical problems that could create a fire hazard. Regular cleaning and inspection of your oven will help prevent rust. It keeps your appliance in good working condition.
  • Rusting not only damages your appliance but can also cause health problems. Inhaling particles of rust can cause serious respiratory problems. So, not only is it important to keep your oven clean and free of rust for safety reasons, but also for your health.
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How To Stop Rusting Inside The Oven?

You can stop rusting inside the oven in a few simple ways.

  • Use a rust-resistant coating: You can buy a rust-resistant coating at your local hardware store.
  • Clean the oven regularly: By wiping down the inside of the oven with a damp cloth after each use.
  • Inspect the oven regularly: Check for any signs of rusting and take action immediately if you see any.
  • Use a stainless steel oven: Stainless steel is less likely to rust than other materials.
  • Keep the oven dry: Avoid using the oven if it is wet or damp.
  • Store the oven in a cool, dry place: If you’re not using the oven, store it in a cool, dry place to prevent rusting.
  • Cover the oven when it’s not in use: If you’re not using the oven, cover it with a dust cover to prevent rusting.

Ways to Remove Rust Inside the Oven

If you notice rust inside your oven, it’s important to remove it as soon as possible. Rust can cause the oven to function less efficiently and, over time, can even lead to holes in the oven walls.

Fortunately, there are a few simple methods you can use to remove rust from your oven.

Method 1:

One method is to mix together equal parts baking soda and white vinegar. Then, using a clean cloth, apply the mixture to the rust spots. Let it sit for a few minutes before wiping it away with a damp cloth.

Method 2:

Another method is to make a paste out of salt and lemon juice. Apply the paste to the rust spots and let it sit for about an hour. Then, using a clean cloth, scrub the spots until the rust comes off.

Removing Stubborn Rust Spot

If you have a particularly stubborn rust spot, you can try using steel wool or a wire brush. Gently scrub the rust away, being careful not to damage the surface of the oven.

Necessary Measures

Once you’ve removed the rust, be sure to wipe down the entire oven with a damp cloth to remove any residue. Then, dry the oven thoroughly before using it again.

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When Is the Right Time to Replace Your Oven?

Rust weakens the oven structure, but with the right repair and preventative maintenance, you can make your oven last. However, there comes a time when even the best repair and maintenance cannot keep an oven going. When it’s time to replace your oven, there are a few factors you need to consider.

  • If your oven does not heat evenly, it’s time to start shopping for a new one.  Uneven heating means that food will not cook properly, and you could end up burning or undercooking your meal.
  • If the oven door does not close properly, it is also time for a new oven. A loose oven door can let heat escape, making your oven work harder and use more energy. It can also be a safety hazard if the door falls off completely.Sometimes it happens due to hinges of the oven door. i have written a dedicated article on fixing the oven door hinges
  • If your oven is more than 20 years old, it is probably time to start shopping for a new one. While ovens are built to last, they do have a limited lifespan. If your oven is approaching or has exceeded its 20-year mark, it is time to start thinking about replacing it.
  • Finally, if you are simply not happy with your oven, it is time for a change. If you find yourself constantly frustrated with your oven, or if it is not meeting your needs, it is time to start shopping for a new one.


Hi, I’m Shelly, a chef by profession and a writer by passion. Here you will find genuine and researched-based information and reviews of all kitchen-related products. Because I have been a professional chef for many years and under my keen observation I have used all kinds of kitchen gadgets. And now, I want to share my personal experiences with the audience through this Blog. I assure you, the information provided here will make your kitchen life much easier.