there used to be a CVJ grease sold that actually had lead in it, it was used in old VW beetle, mercedes benz older models. It would make a smooth coating on parts that would not come off and work for years and years. They phased it out because its harmful to health and the environment.
there are some really good CVJ greases available now that do what the originals did - which was that you cannot get it out of your clothing with any sort of detergent - no matter how hard the detergents advertisement say so.