IEATVETS. I felt the same way. Take a pack of cigarettes or something else that has very thin clear plastic around it. Put your fingers inside the plastic and run it across the paint. You will feel all of the foreign contaminants that attach to your paint and dull the surface.
Lubricate the area and gently run the clay bar across it. Maybe 10-20 quick strokes about 5" total surface covered. Don't press hard or you will spot your clear coat. Repitition is doing the work, not pressure.
Wipe off the excess with a terry cloth. Now rub your celophane wrapped fingers over that area again and continue to move your fingers until you hit an area which you have not covered.
The difference is like rubbing glass and a golf ball. Atleast on my 96 with 35k miles. It pulls out junk you didn't know you had on the paint.
Good luck and enjoy!