What good is it if the DD offers Cholov Yisroel milk? All the keilim and equipment their using to prepare the drinks are Cholov Stam anyways.
DQB: How can a microwave be kashered? And why wouldn’t a single incident ruin its kashrus? The Chasidish velt (as well as some others) generally treat cholov stam as actual treif (i.e. no different than if you were visiting remote Africa and found milk in some hut.) In which case cholov stam is not simply being meikel on a chumra but rather violating an outright issur m’ikur hadin.