Cold water jetwash for me. It works a treat and you can have fun making a water turbine too.
As regards sterilisation, I have ended up taking the same approach as I do with the cider press and associated kit.
I used to meticulously sterilise the whole lot and then pour apple juice into the barrels - along with bits of leaf, twigs, dead bugs, live wasps etc. I now take the view that there doesn’t seem much point cleaning the press and barrels to a higher standard than the apples that are going in them.