How to Clean Used Cooking Oil

Knowing how to clean up (or clarify) used cooking oil will help you get the most use out of leftover oil after frying, searing, or sauteeing. Use the oil for your next batch of Fried Ravioli or Country Fried Pork!

How to Clean Used Cooking Oil

Have you ever wondered, can I reuse cooking oil? Or how many times have you fried something, had a lot of oil leftover, and not known what to do with it?

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It’s not wise to pour it down the drain (bad for the pipes) or add it to compost. So, what do you do with it? You can reuse it! Yep, with this method, you can clarify the oil and use it several more times!

If your oil has ever looked like this⬇️, you are in the right place!

Ingredients

Oil: I tested vegetable oil for this method. I do not recommend other oils with this method, such as olive or avocado.

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Slurry: The water and cornstarch slurry will come together when added to the oil to collect all the debris in the used oil.

Recipe Equation

You may notice in the recipe below that it starts with 1 cup of oil, 1/4 cup water, and 1 tablespoon cornstarch. That is the base amount, but you’ll often have more! To use this equation, just measure how much oil you have in cups and then multiply by that number.

For instance, if you have 5 cups of oil, that would equal 1 1/4 cups water and 5 tablespoons cornstarch.

If you have 1 quart of oil (4 cups) it will be 1 cup of water and 4 tablespoons of cornstarch.

What Does the Cornstarch Do?

Are you wondering… just how does this work?

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Using a cornstarch slurry when clarifying oil helps collect all the debris from whatever you were frying or cooking in the oil. The slurry will be put into the used oil and heated up until the cornstarch becomes solid. Once you pour the oil and cornstarch through a strainer, the solid cornstarch will be left behind, leaving you will the ready-to-use cooking oil!

Does it Matter What Was Fried in the Oil?

Oil takes on the flavor of whatever you fry in it, so it is a good idea to fry similar items in previously-used oil. Yes, even if it has been clarified with the method I am sharing here. For example, don’t fry donuts in catfish oil.

How to Store Clarified Oil

First off, be sure to label your clarified oil with how many times you have clarified it as well as what you fried in the oil. “1st Clarify, Used for Chicken, 5-21-22” If stored properly, clarified oil can last up to a year.

There are a few storage options for storing used oil. One option is to store it in a sealed container in a cool, dark spot at room temperature. A second option would be to store the oil in the refrigerator. The third option would be to store the oil in the freezer. This will give the oil a longer shelf-life. To use, remove the oil from the freezer and allow it to come to room temperature before using. It should not be cold.

How Long Will Clarified Oil Last?

Although I stated you could reuse the oil up to three times, it does depend on what you are frying or using the oil for. Three reuses are generally the minimum number of times, regardless of what you are frying. However, if the oil ends up with a greasy odor, turns brown, or smokes easily, it’s time to toss it.

Simplest Method For Cleaning Used Oil

If you are short on time and planning on frying a similar recipe in the used oil, you can simply strain it. Just pour the oil over a pot that has a fine strainer and is lined with a few layers of cheesecloth or coffee filters. This gets out the large chunks and burnt bits.

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