Danger Will Roger, Danger!
Never but never fly any airplane with any kind of ice on any flying surface, PERIOD!
I do know that it sometimes maybe done, but risk is on the wing. It is not worth it, take a couple of hours off, maybe the day or the week. But, before you wing it again have a clean, ice and snow free aircraft.
Ice is heavy, not to mention airflow problems, just don't do it.
Way to many demonstration of dumb aviatiors, learn from your fellow aviatiors mistakes and not from your own crash.
The Air Florida out of Washingtion DC is a prime example and that aircraft got deiced, but should have gone back for another.
Live long and go to the bar instead.