I have the 'exact' same stains on my X5 running boards after I ran my car through an automated 'hand' car wash (SPLASH) this past weekend. (This is the first time I took the car to a car wash since I bought it - about 2 months ago.) I am going to raise the issue with my dealer too. I tried to remove the discoloration by using a paste cleaner/wax that is made for aluminum - the stains mellowed a bit but still show. Let me know how you make out with your dealer. Thx.