I've never heard of a wax for blue cars. But turtle wax makes the black box. It has a black caranuba wax blend for black cars which I want to try really bad just haven't yet.I didn't realize they had a specific wax for Blue cars. I was under the impression that wax is wax and it'll all work the same. I use Zymol Cleaner Wax on my car. It's blue, but does the job quite nicely on my black car.