If there was only one ingredient to have for all your DIY projects, it would be citric acid!
Derived from lemon, citric acid is a base for creating a multitude of eco-friendly cleaning product recipes at home. This natural biodegradable product is not toxic to humans or the environment.
If it is first used for its descaling power (thermos, coffee maker, kettles, piping and many others ...) It will also be your best ally to remove rust, will serve as a fungicide or bactericide and even as anti algae such as lichens.
It is also an excellent base for making handmade modeling dough or even for acidifying certain recipes, you will not be surprised at the food quality.