You won't damage your car using clay if you follow the directions. You won't ruin it any more than washing it poorly or using less than decent drying towels which will swirl the paint.
All top brand clays will do fine. They come with the lubrication sprays, which are spray on shine liquids. Some use soapy water to save money. Personally I just use the proper sprays. Check out Autogeek.com videos on clay use. It's the only way you will get the paint properly prepped for a good wax application.
Wash car first to get rid of all washable, surface dirt/debris, then follow clay instructions. You will be pleased. And new cars need it as bad if not worse than a year old car. Production, shipping, even dealer prep does not bring you a clean paint ready for good wax. Try it...you won't ruin paint. If still in doubt find someone local to show you how it's done.
