Washing powders usually only contain one type of enzyme, though some have two or all three. A number of the enzymes in biological washing powders are proteases which can deal with stains such as blood, egg and gravy.The addition of an enzyme called cellulase to the washing powder breaks down micro fibrils on cotton, brightening the color of the washed clothes.here is a specific fit between an enzyme and its substrate, meaning that only a particular molecule will fit in the active site of an enzyme, thus each enzyme can only catalyze one kind of reaction that involves specific substrates.