How to Kasher a Microwave – Ultimate Guide 2023

Maintaining a kosher kitchen is a significant aspect of Jewish dietary observance. When it comes to kashering-specific appliances, like a microwave, it’s important to follow proper procedures to ensure the kosher status of your food.

In this guide, we will walk you through the step-by-step process of kashering a microwave, ensuring you can confidently enjoy the benefits of a kosher kitchen.

What is Kashrut and Microwaves?

Before delving into the koshering process, let’s briefly explore the concept of kashrut and its relevance to microwaves. Kashrut refers to the Jewish dietary laws that outline what is permissible (kosher) and prohibited (non-kosher) for consumption. Maintaining a kosher kitchen involves the careful separation of dairy and meat products, as well as the use of kosher ingredients.

When it comes to microwaves, they pose a unique challenge in the kosher kitchen due to their ability to heat and cook food rapidly. Food particles and flavors can become absorbed into the microwave’s walls, ceiling, and turntable, potentially compromising its kosher status. Therefore, it is necessary to kasher a microwave to remove any non-kosher elements and ensure it remains kosher.

Step-by-Step Guide to Kasher a Microwave

1. Clean Thoroughly

Begin the koshering process by cleaning the microwave thoroughly. Remove any visible food particles, spills, or stains from the interior walls, ceiling, turntable, and door. Use a mild detergent or a mixture of water and vinegar to ensure deep cleaning.

2. Wait 24 Hours

After cleaning the microwave, wait at least 24 hours before the koshering process. This waiting period allows any absorbed flavors or particles to dissipate.

3. Boiling Water Method

The boiling water method is Kasher, a microwave’s most commonly used technique.

  • Fill a microwave-safe bowl with water, ensuring enough to cover the turntable and reach a boiling point.
  • Place the bowl in the center of the microwave and heat it on high power until the water comes to a rolling boil. This process will generate steam, which will help cleanse the microwave.
  • Let the steam circulate inside the microwave for a few minutes. This will aid in loosening any remaining food particles or absorbed flavors.
  • Carefully remove the bowl from the microwave using oven mitts or potholders to avoid burns.
  • Wipe down the interior walls, ceiling, turntable, and door with a clean cloth or paper towel. Be thorough in removing any loosened food particles or stains.

4. Kashering Utensils

To ensure your microwave utensils are also kosher, they must be kashered separately. Utensils can absorb non-kosher flavors and therefore require their process.

  • Clean the utensils thoroughly using hot water and dish soap.
  • If the utensils are made of metal or heat-resistant materials, such as glass or ceramic, they can be kashered in boiling water.
  • Immerse the utensils in a pot of vigorously boiling water for several minutes, ensuring that all surfaces are exposed to the boiling water. This process removes any absorbed flavors, making the utensils kosher.

5. Regular Maintenance

To maintain a kosher microwave, it is essential to follow these tips:

  • Avoid placing uncovered non-kosher food in the microwave, which can lead to contamination.
  • Use microwave-safe covers or wraps to prevent splatters and spills.
  • Regularly clean the microwave after each use to remove any potential residue.
  • If a spill or splatter occurs during microwave use, promptly clean it to prevent the absorption of non-kosher flavors.
  • Consider designating separate microwaves for dairy and meat products to avoid cross-contamination.
  • If a non-kosher item accidentally enters microwave, such as a utensil or container, it should be thoroughly cleaned or replaced before further use.
  • Routinely inspect the microwave for any signs of damage or wear. If the interior walls or ceiling show signs of peeling or chipping, replacing the microwave to maintain kosher standards is advisable.
  • Stay informed about updates or changes in kosher guidelines or practices to ensure ongoing compliance.


Kashering a microwave is crucial in creating and maintaining a kosher kitchen. Following the step-by-step guide outlined in this article, you can ensure that your microwave remains kosher and free from non-kosher elements.

Remember to clean the microwave thoroughly, allow a waiting period, and use the boiling water method to cleanse the interior surfaces. Additionally, kosher utensils separately to maintain their kosher status. Regular maintenance and proper usage habits are key to preserving the kosher status of your microwave.

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