A friend of mine accidentally crossed over newly painted yellow highway marking dividers and now has yellow paint in the wheel wells and on the the lower door sills. The paint is now dried on. She asked what she should use to remove the yellow paint. I really don't know, because all I have are mild, paint friendly cleaners. What does anyone recommend? Obviously I want to recommend something that will take the paint off both places, but won't harm/dull/scratch her BMW paint.