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I woudl avoid touchless car washes, expecially if you have the shadowline trim on the outside. The chemicals in the soaps they use is very strong and will cause a discoloration on your trim much like a rainbow effect. I had this problem with the shadowline on my 545i and I will tell you ITS A BITCH to fix. Alot of elbow grease and Goo Gone might get it back to 50% of original finish.
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