I got mixed results. MP66s wash fine in the washing machine when mixed in with lots of (2nd tier?) towels with normal non bio.
MW80s appear sensitive to what washing powder you use. In retrospect I'd only put them in the machine with goretex specefic stuff (eg grangers / techwash / ,,,).
either way – wash at a LOW temp, sensitive / handwash setting and dry them as quick as possible to stop the bacteria regrowing. Maybe with a fan or near a radiator with some airflow.
Oh – and take the cleats off and the insoles out. Realistically I dont think they will survive this treatment forever but it does extend their (non smelly) life.