Avbug... I believe he is referring to Protective Film P/N: 7305 for the clear plastic stuff. I do not know what the P/N is for the green stuff they use.
Aviall has some of the film tape (P/N: 5413-3) that will work.
I've seen the blue painters tape used too (and used it), but it depends how long the airplane will be there and what's being done. Generally there's no need to cover the brightwork. If it's going to be more than a week, I wouldn't use paper tape.
At Bombardier in Tucson they have aircraft-specific leading edge covers that extend up the winglets and attach with suction cups. I'm not sure what they are made of, but they seem to be pretty heavy duty and likely to protect the leading edge from most conceivable damage.
Perhaps it's not as big a concern around aircraft with high wings, but I can certainly imagine a tool cart rolling into a Learjet wing. As they say, "An ounce of prevention..."