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A large class of complex proteinaceous molecules, which act as catalysts in biochemical reactions, and as produced by living cells can bring about digestion (breakdown) of organic molecules into smaller units that can be used by living cells. Selected types of enzymes are useful in laundering, particularly in presoaking, where they break down certain soils and stains to simpler forms, which are then more readily and completely removed by the laundry soap or detergent. Reasons for their primary use in presoaking are: they need more than the usual wash period of 10-15 minutes to be effective, especially on stubborn stains and soil; also, their effectiveness is deactivated by liquid chlorine bleach, so the two must be used separately to obtain the full benefit of each.