There will be so little wax in the wash and wax, it wont make a difference, the polish will cut straight through it (if the polish is a true abrasive). Ideally, you would use something that will cut through wax to wash before a polish, like something with citrus in. This would mean the polish is working straight on the paint. All you are doing with wash and wax is making the polish break down the wax before it gets to the paint