Since even the more expensive cars don't have 100% leather seats with the sides, backs of the front seats, armrests, etc. being matching vinyl, what is the best way to protect them? I use Lexol on leather and a Meguier's product on vinyl. It's often hard to tell what's leather and what's vinyl so sometimes I get the wrong product on each. Is there a better solution? Is there a product that is meant to be used on both?