I washed my utensils up in my milky sink in hot water. There was a whole large cockroach in the bottom of the sink. Is my sink/dishes treif? I wash under running water so there was likely no large accumulation of water at any one time. It is Also possible that the water hit the insect directly. Thanks!

Shalom, Everything is still kosher - except the cockroach! The taste that comes from hot water running over an insect is minimal, and therefore nullified, as well as being "p'gam", untasteful (to say the least) and therefore does not imbue your sink or plates with unkosher taste. Blessings.