So I wash the windshield with ONR and then clay it with ONR as clay lube. I then finished with a glass cleaner. I notice there are still some small dark marks (don't know if its tar). I think i may need a cleaner that will go deeper. Will KAIO be a good try? Can the "stuff" KAIO leave behind be removed with a light mist of glass cleaner? I havent tried ISO at 50/50 yet.