Back in the day cleaners used a four-step process, not the one-step that is commonly used today. The cleaners of that time would pre-vacuum, pre spray, edge and clean. Today’s procedure is more expedient: crank up the heat and pressure and your done. If you are one of those cleaners who are precise and want to do a great job, then consider the crevice tool. This high-pressure tool is designed to remove the filtration dirt that accumulates at the very edge of the carpet. The crevice tool also works great for stairs! All stainless steel construction with 1000 psi valve. (You will only use it a 300 to 500 psi).