I always thought that you were supposed to use dishwashing soap to remove the wax....what are you supposed to use???bmwsfca said:Whatever you do.....don't use dishwashing liquid. Guarantee to do some serious damage to the paint and trim. The damage will appear later on as the soap blends into the paint.
Don't know if you take your car to an automatic car wash. It does appear that the stain is residue.
I would consult some local body / detail shops to see what they have to say.
I don't know what the trim is made of. Some are really metal but lately it's a thin metal layer on top of plastic with a plastic coating on top of the metal trim.
Unless otherwise instructed, I may try some polish as a last resort. Real polish is a light abrasive. Believe it or not....toothpaste may also work. Make sure to rinse completely. The sweetners in toothpaste may do damage.
Hopefully, some of our fellow bimmerfest-ian's have some body work experience.