I tried to clay my hood the other evening and was shocked at the amount of junk I got off of a 3 week old car. I was even more shocked that I didn't get all the contaminants off.
I highly recommend having a pro get the car right the first time. If you're good you can maintain it for 6 months or a year and then bring it back to be restored. If you're not that good or don't have the time, set up regular appointments. Your car will thank you, and your neighbors will envy you.