Here's my 2 cents. I'd say stay away from machine washes. I just took the time to wash my MY at home using professional grade soap, glass cleaner. etc. Everything was fine with the trim until I let one side of the car dry up (I never, ever wash my car under direct sunlight either). I did notice that just the calcium from the hard-water easily causes faint water spots to form on the trim. Nothing a little bit of foam-based glass cleaner couldn't remove but I can only imagine what those harsh, highly acidic chemicals will do to the trim finish.