Hm okay it goes up to 90C so I might try that for the next round.

Tbh I haven't given my own machine a hygiene wash for several months now despite it being a monthly reminder on my phone, but I'm inspired to go do a scrub and clean when I head back to mine on Saturday. Theirs is a lot dirtier because they do multiple loads a day with a reflux prone baby and very little time to look into such things (though the rest of the house is sparkling).