We used to throw knives in the dishwasher with everything else. Problem was, “gunk” (scientific word for stuck-on food left from chopping onions, raw meat, and tomatoes) would still be on the sides. Luckily, there’s a neat trick for cleaning knives without dulling their edges—a cork. Simply dip one in vinegar and use it to rub off the gunk, then wash by hand with a soft cloth. No scrubbing necessary!