Transforms cooking oil into detergent.

The idea, launched by a Spanish environmental engineer, is simple: you buy a bottle of this product and, with that, you can recycle used vegetable oil of any kind, such as olive, coconut or sunflower oil. After filling the container and removing it strongly, liquid soap is obtained. A bottle of SOUJI allows you to recycle up to 230 milliliters of waste oil after cooking with it.  

Source

As you can see in the video, this idea is intended to encourage the recycling of vegetable oil and stop the environmental impact that occurs when thrown down the drain. Hence, its name, SOUJI, cleanliness in Japanese, chosen for "the great responsibility of the Japanese culture with the order and cleanliness of the environment," the promoters say.