Dennis that may be. I have found the wax that is synthetic. Car collectors use the stuff and serveral other RV folk's I know intoducted me to it. It's a little pricy, by I have never used a wax that is so easy to put on... Get a small pint bottle and try it.
www.finishfirstpolish.com Tell Homer John Hogan sent you. I hate waxing and like this so much both the trucks wife's car and 5er got it and I am not really tired although it did take a few days to get two coats on. You will also notice that the black streaks just wipe off with a soft rag. no scrubbing or using harsh detergent like I have done so many times... You really need to try the stuff. You will not be sorry
Stay safe and Happy John H (aka Hemlockusa)