long ass extension cord ? hand buffer might have more strength than a 12V vig powered buffer....

If you want to get it semi-serious on detail, check out the detailing links above

Or a quick step process as in -

Iron X on Wheels
Iron X on Paint
Nanoskin followup on paint or clay
Polish - whether it be 1 step or 2
Cheap and durable - Collonite Offerings
Spray and wipe dry - but only 2/3 months durability - Gyeon Wetcoat
6 Months + - Millions of options, all depending on your pocket or your golden eyes

IMO, cleaning the paint prior to polishing is one step to NOT BE avoided