I have tried most all of the popular products. I wax my black vette with zaino, everything is perfect. but this is texas and you almost always have to use a detail spray. All streak on a black car including zaino,meq, etc etc. What I use is one capful of zaino carwash in a quart spray bottle of distilled water and it is tough to detail but it does not streak. Does anybody have a better product that will not streak on a black car. Most all regular products work on most colors but black has stomped me for years.