i have never used adams polishes but I hear nothing but good things about it. for me I have a black z as well and I use the two bucket method and a leaf blower to dry the car. towels/shamies can scratch especially on black. a good polisher with a cutting pad and something like a mothers compound wax/sw remover. then you can followup with the wax of your choice. I use zaino and after a few applications there are no scratches. if your scratches are down deep you could also use turtle wax black box wax that is color matched for black cars. I have had success in the past with that as well.
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