Also popular, especially for organic stains, are enzymatic cleaners. These use sets of enzymes to break down the molecules of the staining substance. Lipases, for example, break down lipids like olive oil. Many of these are more environmentally friendly than their harsher brethren. But these cleaners can vary widely in concentration and the type of enzymes used. In some, the labels won’t disclose which enzymes are in the mix; instead, they list an “enzymatic blend” as an ingredient. Unlike surfactants, you might have a harder time finding these stain removers in a pinch, such as when you’re traveling or away from home. To purchase this type of cleaner, check the label of a commercial stain remover for terms such as “enzymatic action,” and look closely at which types of stains it promises to treat.