Comment by krisoft

> once properly dried

That “properly” is doing most of the heavy lifting there. The reason i would be weary of running the dishwasher with a toaster inside because i would worry that liquids trapped around thin electric conductors will corrode them. In othet words toasters were not designed to be easy to “properly” dry them out. And that damage might not be appearant right away or after a single wash.

In fact i wouldn’t trust the professor’s claim that the “toaster is perfectly fine” unless the professor conducted a lot of experiments. And even then i would only trust it with the toaster models he tested the claim with.