I was at an ice cream shop with a pretty good hechsher, and saw the lady working there use the same utensil first in Milchig ice cream, than to Parve.
I didn’t say anything because she was already being mean to me (I can’t remember more than that, this was about a year ago) but never managed to figure out who the manager was…
EVEN a good hechsher, would not have stopped this.
This non-religious girl simply did not CARE.