Properly Clean Your Knife The process of cleaning your kitchen knives often results in unnecessary dulling. The biggest culprit is the dishwasher. In a dishwasher, the knife edges are much more likely to come in contact with other silverware or ceramic dishes. This banging around will cause small imperfections in your knife edge and dull it over time. The solution is to wash your knives by hand. Washing knives by hand also saves the handle material from the soaking and the high heat of a dishwasher. When washing knives by hand, avoid the temptation of soaking your knives in your cleaning water, in addition to possibly damaging the wooden handles, sharp knives are not something you want lurking in your cloudy dishwater. In addition, after your knife is properly washed, it’s important to dry your knife thoroughly before putting it away.