I have worked on Honda Accord that is 8 years old and never polished. Resulsts where perfect. I've use fg400 with Menzerna wool pad to get rid of rds and hevy swirls and after that pf4000 on Menzerna black waffle pad. After FG400 I have some hollograms left but with pf4000 finish was perfect.
Holograms:
After pf4000
Final result
Cheers
Holograms:

After pf4000

Final result

Cheers