How to reuse used cooking oil

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How to reuse used cooking oil

The oil is an ingredient that is widely used in our kitchens, especially vegetable or olive oil, so it is common for us to meet a lot of used oil and we don’t know what to do with it.

One of the best options for to give new use to cooking oil is to turn it into homemade soap or detergentmade with simple products that we can buy without problems in any store in our area.

Used oil harms the environment

never throw the oilif you don’t feel like making soap, we advise you to recycle it by taking it to a collection point, otherwise you will be harming the life of your pipes. Used oil that is not recycled poses a serious danger to nature, since treatment plants are unable to completely eliminate its waste, which ends up polluting the environment for years.

Reusing cooking oil: Bar soap

To make this soap we will need 4 liters of water, 2 liters of oil to recycle, half a kilo of caustic soda and another half of ashes or if we prefer powdered detergent. We have to mix all the ingredients and stir them quite often for at least a couple of hours.

When we notice that it begins to curdle, we pour it into a bucket whose surface we will have previously covered with newspaper. We leave it for a couple of days until it gets hard and we can cut it, giving the shape we want to the pills. Let dry for one more day and we can use them or store them in a container or wrapper.

Paste detergent to reuse cooking oil

We will need 7 liters of water, 1 liter of used oil, 200 grams of caustic soda and a liter of liquid detergent. The preparation is very simple, we mix everything carefully since the soda is harmful to our skin and we should not inhale it, so the use of gloves and a mask is recommended. It is left to rest for a week, after this time we have already made our own paste detergent.

It is perfect for treating stubborn stains, such as those on shirt collars or sleeves. We can throw it in the washing machine and the clothes will come out perfect, or use it as a stain remover by applying directly and rubbing before washing.

Turn used oil into liquid soap

For the preparation of liquid soap, one liter of oil is required to recycle, 13 liters of water, 200 grams of caustic soda and one liter of softener or powder detergent. Mix the oil, 2 liters of water and the soda, the rest of the ingredients will be added later.

We have to stir constantly for at least 45 minutes and it is advisable that the water is lukewarm. We repeat this operation 3 or 4 times a day until there is practically no liquid left, then we add the rest of the water and the detergent, powder or softener, as you prefer. You can also add essences to give it aroma.

Make candles at home with used oil

Did you know that you can use used cooking oil to create your own candles?

  • The benefits of creating candles with recycled cooking oil are several, for example if the oil is olive it will not produce any odor once you light it.
  • It is friendly to the environment as it produces less toxic smoke than paraffin or mineral oil candles.

You will need to:

  • 1 glass jar or cup that serves as a container to hold the candle
  • Salt
  • used cooking oil
  • 1 candle that we will use to provide us with the waxed wick
  • 1 stir stick


  1. Salt will be added until the jar is half full.
  2. And what is missing will be filled with the oil (The oil must be very well filtered before using it).
  3. It should be stirred well with a stick. Put the thin candle in the middle of the jar.

And that would be all you need to take advantage of and reuse used cooking oil and give it a new purpose.

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522 points