Why Your Microwave is Rusting and How to Prevent It

A cosy kitchen with various appliances, including a microwave, illustrating why your microwave is rusting.

Microwaves are a staple in modern kitchens, offering convenience and efficiency. However, one common issue many people face is rust forming inside their microwave. Understanding why your microwave is rusting and how to prevent it can save you from costly repairs or replacements.


Common Causes of Microwave Rust

High Humidity and Steam

One of the main reasons microwaves rust is due to high humidity and steam. When you heat food, moisture is released and can settle on the interior surfaces of the microwave. Over time, this moisture can lead to rust, especially if it is not wiped away after each use.

Food Splatters and Residue

Another culprit is food splatters and residue. When food splatters inside the microwave and is not cleaned up promptly, it can create a breeding ground for rust. Acidic foods, in particular, can accelerate the rusting process if left unattended.

Damaged Coating

The protective coating inside your microwave can wear down over time, making the metal underneath susceptible to rust. This wear and tear can result from frequent cleaning with abrasive materials or from placing heavy objects inside the microwave that scratch the surface.

Leaks and Spills

Spills and leaks from liquids can also contribute to rust. If you frequently heat liquids in open containers, they can spill and seep into the seams and joints of the microwave, causing rust to form in these hidden areas.


Preventing Rust in Your Microwave

Regular Cleaning

To prevent rust, it’s essential to clean your microwave regularly. After each use, wipe down the interior with a damp cloth to remove any moisture or food particles. For stubborn stains, use a microwave-safe cleaning solution.

Use a Cover

Using a microwave-safe cover can significantly reduce the amount of steam and food splatters inside your microwave. This simple step can prevent moisture from accumulating and causing rust.

Avoid Abrasive Cleaners

When cleaning your microwave, avoid using abrasive sponges or cleaners that can damage the protective coating. Instead, use a soft cloth or sponge and a mild cleaning solution.

Inspect for Damage

Regularly inspect your microwave for any signs of damage to the interior coating. If you notice any scratches or peeling, consider repairing the coating with a microwave-safe paint to prevent rust from forming.

Proper Ventilation

Ensure your microwave is properly ventilated. If your microwave is built-in, make sure it has adequate ventilation to prevent moisture from getting trapped inside. Good airflow can help keep the interior dry and rust-free.


Rust in microwaves is a common problem but can be easily prevented with regular maintenance and proper care. By understanding why your microwave is rusting and taking steps to keep your microwave clean, using a cover, avoiding abrasive cleaners, inspecting for damage, and ensuring proper ventilation, you can extend the life of your microwave and keep it rust-free.


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