Waxing my car

I would recommend using dish detergent to remove any old wax on the car. I would also clay bar the car next to remove anything else the dish detergent didn't remove. You will really be able to tell the difference in the feel of the paint after you clay bar the car (very smooth). After this, then I would apply the wax. The clay bar kit can be bought for around $10 at any Pep Boys or Advanced Auto. Another note, the wax will be a lot easier to remove if you clay bar the car first.