These are Borla stainless steel exhaust tips. I noticed over the winter that they'd developed these unsightly grayish-whitish marks (circled in the pictures below). I have tried Eagle One Nevr Dull and Heavy Metal Medium Abrasive metal polish on them and these marks haven't budged.
Does anyone have any suggestions what I could do next? Are they ruined? I don't know if this is damage from salt or chemicals from the winter season or what. They never had anything like this on them during the summer months last year.
I'm really kind of at a loss, so any suggestions anyone has would be most appreciated. If you folks can't figure it out, probably no one can! Thanks in advance.
Does anyone have any suggestions what I could do next? Are they ruined? I don't know if this is damage from salt or chemicals from the winter season or what. They never had anything like this on them during the summer months last year.
I'm really kind of at a loss, so any suggestions anyone has would be most appreciated. If you folks can't figure it out, probably no one can! Thanks in advance.

