ASRAAMTOO
Well, I have been retired for 24 years but flew jets for all of my 34 years of jet flying, since I was 18. I have never been deiced engines running, so I checked the wings, stab, and fin from pax and service doors of my 73/ 75/76 or whatever. Seen no reason why the wings, at least can’t be checked via the D. V windows or the pax windows.
Ice contamination is a potential killer , remember the Potomac, hence my extreme caution, for which I make no apology.
Perhaps the world has moved , but in this aspect Im not sure it has improved.