In a previous thread I showed before and after photos on my M35. People ask how I did it. I send them to watch Jim White from White Details. His bookings are months i advance and he has really made a name in the UK. I learned my technique and process by watching him. He just released a new vid of Maserati that was in much the same condition as my new M. I use a variety of brands like Griot's, Gyeon, Rag Company, Adam's, etc. I also have a Griot's boss D/A and Rupes nano ibrid D/A polisher with Meguiar's pads. Here is a link to what Jim uses on Amazon: https://www.whitedetails.co.uk/news/amazon-links/
Here is a video that resembles what I did to the M to bring it back to life:

I've heard a lot of good stuff about Griot's.