A car I had suffered from polish applications, and as Joe said, a lot of polishing does take the paint off.
I went then to wax on both Jaguars I have had, and have now settled with Bilt Hammer double speed wax which contains Carnauba Wax and hydrophobic polymers. I tend to avoid too much shampoo and have found that luke warm water and a very good rinse gets the dirt removed and ready for the waxing.
My car sits on the drive as the garage is the home for SWMBO's Toyota Hybrid.
Regards,
Peter.