Where do I start?

If the Maserati paintwork is in good condition, I'd not use the polishing compound you mention. Instead my suggestion would be Auto Brite Direct Citrus Wash, then their Tar Remover. Wash the car with Auto Brite Car Shampoo. After that, Maguiars Clay Bar Kit. Then PoorBoys Showroom Glaze polish by hand. Finally Dodo Juice Purple Haze carnauba wax. Wheels - only hot water with car shampoo.
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