first - be certain never wash or dry a black car in the direct sun. i would also recommend a quick detailer/lubricant for wipe downs or after washings - but it sounds as if your car may need a polish before waxing - a quality meguiars carnuba paste wax should do the job - always use a microfiber towel to remove wax and any quick detailer product - wax a panel at a time and immediately remove the damp wax with the microfiber towel - this should do the trick.