Ive had them on my black cars (swirl marks) I use 3M polishing compound. and an orbital buffer. Not a circular polisher/grinder The grinders will easily burn thru. By applying the 3M and working the buffer over the spot as it warms up it will eliminate the marks. This job takes alot of muscle and hard work. My 87 grand national 3yrs old didnot have a mark on it. Good Luck
jjrocks
Blk Bullitt #2754
Jim
jjrocks
Blk Bullitt #2754
Jim