Sometimes it's not possible to clean the last inch along the baseboard. The Cimex, CRB, Rotary scrubber, etc can't get all the way up to the wall. And let's face it, that's not usually the dirtiest part of the carpet, so it normally just needs a lighter cleaning. And that's where the Edge Brush comes in handy. Simply spray Releasit along the edge and brush by hand. Simplifies the process of cleaning the last little bit of carpet next to the wall. It also works great on "filtration line soiling.