"Which one of your degreasers would you recommend for wheels, wheel wells, and engine bays? I need something safe on all metals and wheels." CG- "try premium blue I think you will like it." "Is there anything premium blue shouldnt be used on? Will it brown tires?" "Premium Blue is safe for tires and rims, just make sure you clean the tire thoroughly before applying your dressing and you should not have a problem with brown tires." I know exactly what you mean about their descriptions.