Is WD-40 good for cleaning knives?

WD-40 is acceptable for cleaning some knives, but it is not the best cleaner for most knives. It removes adhesive, grime, light rust film, and moisture well on utility knives, pocket knives, and shop tools. It is not food safe, so it should not stay on kitchen knives or any blade that touches food. WD-40 also leaves a residue that attracts dust if you overapply it. For a kitchen knife, warm water, mild dish soap, and immediate drying work better. For a pocket knife, WD-40 can help during cleanup, but a proper knife oil or mineral oil is better for final protection and lubrication.