I have heard some say that they use a wash and wax soap when just washing their car, but a regular soap, when they want to wax their car after washing. My question is: if a wash and wax combo is better because it does not strip wax off the car, wouldnt it be better to use even if you are going to wax the car when you are done washing? That way, you would keep more wax on the car. Or is it important to always start a wax job with no wax on the paint?