The only accessory that can be washed without problems both in the dishwasher and by hand is the wire whisk

The other two accessories, the dough hook and the leaf mixer, must be washed by hand ONLY with hot water and dish detergent.

The latter are in fact made of aluminum alloy and must NOT be washed in the dishwasher as they would oxidize causing them to blacken. Oxidation is caused by the chemicals in the dishwasher tablets