The Saab language refers only to the upper surfaces of the fuselage. They are quite clear about insuring that the upper surfaces of wings and tail are free of contamination. This is nearly identical to the language used by Boeing on all models, 737 included.
To my knowledge, there is no manufacturer who recommends takeoff with any amount of contamination on the wing upper surface. There is far too much evidence regarding the serious aerodynamic effects, and the resulting hull losses.