Get directly to the source of dog, cat and people created stains, urine and odors. Inject liquids directly into carpet, padding, flooring, mattresses, upholstery. Unless you get the active ingredients in stain and odor products directly to the source of the problem, the problem will not go away. Stainless steel needle will penetrate and allow you to squeeze liquids quickly and you will use less liquid to get rid of stains and odors.