Thanks for your help. Actually, the roads in North Idaho and eastern Washington are not salted. Eastern WA uses a de-icing solution. (We lived most of our lives in the northeast - NYC & NH -and I believe those states have also quit using salt.)

Anyway, I'm shortly due for the 21K check, so I'll tke your advice and inquire as to possible replacements. It's not a big deal, but it could get worse. Also, I think I'll order the Collinite chrome polishing compound, and I'd be happy to share with my experience with the board.

If can at least retard the process, I can live with it.