Truth be told, extraction cleaning is does work. In fact, it is absolutely necessary when cleaning with soap and detergent to rinse, and extract the soap and excess water from the fibers(refer to home page, ie; residue). While extraction does work well with our patented cleaning solutions, we have found over years of experience, that bonnet cleaning is the most effective method to use in conjunction with carbonation. Because our products require no rinsing process, carpet/upholstery dry quickly, and are left with no dirt/oil attracting residue. Thusly, your carpet and upholstery dry faster, and stay cleaner, longer.