OxyPRO has a dual-chamber design to effectively treat different types of stains with one press of the trigger. To achieve this, the two chambers combine to produce a very powerful stain remover. One chamber contains tough cleaning agents designed to remove oil-based spots and stains. The other chamber contains an oxygen activator designed for use on dye-type stains. The contents of each chamber combine to remove such stain as red wine, cola, fruit juice, Kool-Aid, coffee, gravy, lipstick, ink and motor oil.