Rotary's are notorious for leaving swirls, hence UDM's and PC's....
I would first try a polish, then try a clay bar, then try the Farcela. Each time you are using something slightly more abrasive, and there is no point jumping to the most abrasive if you don't have to.
Anything abrasive put on something rotating hundreds of times a minute needs practice, hence my Volvo as a donor vehicle!!