I use and firmly believe in using either 0000 steel wool,or the 3M nonwoven wool in the maroon or gray color. The steel wool is cheaper than dirt,and I use a smal chunk off the larger pad and apply some Dawn dish soap and have at it under running water. I go over the entire body,checking for seams,around wheel well lips that kind of thing.Rinse and pat dry and let air dry.Go over the body and see if any areas need special attention with sometime coarser.If not,spray on alight coat of primer and check for flaws. HTH