If this is the case trinny you may probably have saved the day.
I found difiicult to believe there are pilots doing this mistake,taking ice for laugh.Also I found dificult to believe that no other crew member alerted the pilots about the contamination on the wings.
I usually ask the flight attendants at the briefing to inform me if they see anything out of ordinary,and ice or snow on the wings will definetly be something in this category.
Brgds
Alex