Anyone out there ever actually used a teflon/PTFE paint protection product such as "Toughguard" or "5 Star"? <P>Supposedly, a one-time application will last 5 years on new paint and up to three years on a used car (more than a year old). <P>If so, does it work any better and stay on longer than a polish/wax treatment?<P>Thanks for your comments.<P>