So not sure if you all have the same issue, but my piano black pieces on rear trunk lid and between the door windows were starting to get an insane amount of spider web effect. I took my polisher to them last night and was able to return them to a brand new like finish.
I was to the point of wanting to vinyl wrap them not too long ago because I couldn't stand the spider web look. Plus I had a bird dropping etching in the rear panel that was also removed completely.
I am not going to market the products I used. If you have the same issue PM me and maybe I can help give advise on how to correct the issue.