All you need is a standard piece of aluminum foil. Crumple it into a small ball. It is important that the shiny side faces out. The aluminum ball now goes in the cutlery basket of the dishwasher – select the usual wash cycle, wait and be surprised: the cutlery shines like new again.
It all works because the so-called rust film, e.g. from the screws inside the machine, now settles on the aluminum foil instead of the cutlery. To some extent, this acts as a lightning rod, as it oxidizes more easily than the premium stainless steel of cutlery and is therefore more susceptible to rust.