I use Italian dressing with some lemon for beef on the grill, steaks or skirt.. I use just a whatever bottle of teriyaki (chicken or pork) marinade but always add brown sugar, fresh minced garlic and if I have some Cantalina dressing I'll add that.. my secret ingredient for teriyaki is a spoon of spicy hot mustard.
If I dont have time to marinade I just rub the meat down with lemon and fresh garlic..