Why does washing knives in the dishwasher dull them?

Question

Why does washing knives in the dishwasher dull them?

In: 890

Answer 1

One possible theory I came across, even if your knife is immovable in the plastic tray, the water jets cause a slight difference in voltage between the knife and tub of the dishwasher which causes electrolytic corrosion right on the edge.

Again just a theory. The best sharp knife is a honing rod.