Both my XS650s needed work in this area. The Blue Tracker was decent so a paint stripper routine (several applications, rinse, repeat) worked, following up with a buffing wheel on a drill motor. The Red Bike had a lot of aluminium corrosion and needed the roloc to clean up. Then a medium grit (30 or 50) Maguires polishing compound (this for paint job buffing) took out most of the scratches, followed by Mother's aluminium polish. The Maguires bottles look similar but the little scale on the left side indicates how coarse the compound is. This one below is pretty fine at a 30 rating. This is for paint or gelcoat so you want to stay away the coarser grades.On this case I used paint stripper to remove 75% of the clear coat, then a blue Roloc disc to complete the rest. Then I used 220 sandpaper to clean up the corners and scuffed the whole case to give it a more uniform appearance. That was good to remove marks left by the Roloc. Then I wet sanded with 400, then 800. The scratches are most likely from the 220 sandpaper. If I was looking for a “show” finish, I would have spent more time on it wet sanding, maybe adding 600 and 1000 to the mix. For me, I just wanted the corrosion yo be cleaned so this is good enough.
I didn’t use steel wool on the aluminum but used it to clean up the chrome.