Over time, dirty signs of wear become noticeable on every pair of shoes. Can the sneakers then also be cleaned in the washing machine? It's all about the material.
Excessively high temperatures will cause the glue on the soles to come loose or damage the insoles. It's best to place the pair in a wash bag so they don't get thrown around too much. Proper drying is almost as important as washing: as soon as the shoes come out of the machine, you should stuff them with newspaper.