Top job getting that ball swirl out Nino.
Noticed you use alcohol with the eraser, do you prefer it compared to novus ?
When you say alcohol, is it Isopropyl alcohol ?
Yes Kev - Isopropyl alcohol, Magic Eraser and lots of patience.
Cleaning the ball swirl is a process I do after I've cleaned the dirt with Nifti. I then move to Novus 3 and then Novus 2. At this point I can see anything I have missed. I then clean again with Metho so I can prep for painting.