We have used protease enzymes in our detergent for multiple reasons. Firstly, they are made naturally by plants and fungi and are great for the environment. Secondly, protease enzymes are extremely effective on common stain components such as food, grass and blood. Lastly, the addition of protease enzymes to the laundry sheets allowed us to develop a highly efficient and sustainable detergent, as one protease enzyme is able to work on many molecules of substrate (dirt). The efficiency of the protease enzymes means we can omit the conventional chemical nasties from our formula and provide a lightweight and highly efficient detergent.