Looks like etching to me. Possibly from a chemical/cleaner the previous owner used.
I'd try polishing the sh!t out of one area and see if that helps remove it. I mean work the area with your cone/hand/etc and see what it does.
You can also try some heavy compound (for paint if you have any) and see if that reduces/removes it.
If it's still there it may need to be sanded and then polished...
I'd try polishing the sh!t out of one area and see if that helps remove it. I mean work the area with your cone/hand/etc and see what it does.
You can also try some heavy compound (for paint if you have any) and see if that reduces/removes it.
If it's still there it may need to be sanded and then polished...