When using ME/IA be very careful with the paint, and it probably depends on the vintage of the machine as different paints were of course used over the years.

I found using ME/IA was great to remove ball swirl, but it can be alot of work.  There are times when you've had enough,  but press on to get the job done.  But ..... you need to be careful not removing paint.  After using for short periods, it pays to check the ME now and then for any signs of paint (I got caught out a few times going too hard and too far).