Sos Sub-Surface Stain Removal Tool The SOS Sub Extraction Tool is used by professional carpet cleaners to extract liquids and odours, such as pet urine, that have absorbed beneath the carpet surface. This tool also work for flood extraction on smaller areas. Sub Surface Extraction is used by professional carpet cleaners to thoroughly remove contaminants, liquids, and odours that have soaked into carpet padding and upholstery. Short of removing carpet, sub surface extraction is the best method for flushing out the true cause of odours and reappearing spots. Universal Fitting, will fit all carpet extractors using conventional vacuum hoses. HOW IT WORKS Step 1: Saturate the affected areas with your chemical. Allow the cleaning solution to seep deep into the carpets backing, padding, and subfloor, in order to target the entire odor source. Step 2: Finish by using the the SOS Tool or the SOS PRO with an extractor or truckmount to flush out the solution and contaminants from the ca