Heres another trick I learned from a fellow lineman.Roll your window down on your vehicle and hold the same angle that the knif or serration has and stroke across the top of the vehicle window for each serration.Usually when I camp,hunt or fish I do this,especially when I take to the woods,or getting ready to fillet some fish.Try it it works great.I have a one of the good knife sharpening sets but have found that the window works just as good and is less of a hastle.Now at work our knives need a rougher edge(for skinning high voltage wire insulation),the razer sharp smooth edge doesn't work as well.So we use a file,grinding wheel,or stone.