Polish the Ice?
I don't remember seeing anything official about takeoffs with the ice on the wings polished instead of removed. It is done though, in some conditions it is the only way to do it since some temps prevent removal of the ice completely (using hot water gets the ice off but it freezes in turn and all you can get is a smooth surface, with a small layer of ice remaining).
If the ice is light rime or frost it is easier to rub it smooth than to scrape it off or wash it off with hot water and it seems to work, but is that covered in any country's rules?