Welcome to all things Optimum! I think you mean "Optimum Car Wax" not "Wash" in question #1? If so, yes, Optimum Car Wax can be a stand alone product. Obviously we recommend Optimum Car Wash, but there are quality alternatives. Most, but not all products can be interchanged with good results. We recommend the Optimum Synergy because we KNOW all our products are formulated to work together.