Alex
Carry a can of car windscreen deicer even for a little its not good practice to attempt a takeoff and at what point does a little become a little too much ?
Some wings are critical to any pollution or icing. The Challenger 604 crash out of Birmingham was caused by a pilot deciding that there was just a frost on the wing.
So for the price of a tin of deice spray any icing on the wing is a no go
Pace