Sous Vide

What process is required to kasher a sous vide for Pesach, if any? Does the answer change if it was never used with chametz, and only used for meat, fish, eggs and vegetables?

Crock pot : fry daddy

Hi, I was wondering is it possible to kosher a crock pot and fry daddy for Passover ?  if so can you let me know how ?

Milk frother

Hi, Can a Nespresso milk frother used during the year only for milk (but washed with a sponge used for utensils with chometz) be used on Pesach? If so, does it require Kashering – and how would that be done? Thanks!