Question: A bakery has a coffee machine which is only used in conjunction with coffee beans. The milk (which will be added to the coffee) is placed in an external metal jug which is placed under a pipe which blows hot air into the milk causing it to froth. The milk is then poured into the coffee and the jug and hot air pipe are cleaned between each customer.
If the machine has previously been used with non cholov yisroel milk, is it permitted to have a coffee from this machine?