There is a guy here in San Diego that details exotic cars for Concours shows and big $$$$ clients. I've picked his brain a few times and learned quite a bit. He showed me something that blew my mind. He took a digital camera and photographed the hood of a Ferrari that I thought was in pristine condition. He kept blowing up that image and after a few enlargements you could see the swirl marks which I believe he called "spydering". The owner of the Ferrari which was red, used a California Duster.
When I mentioned California Duster he freaked out and said "never use those things".
As he explained it to me using the duster just takes the dirt and spreads it across the car adding fine scratches to your paint. Remember that duster is dry and has no lubricant, kind of like low-end sand blasting. Now this is the part that really got my attention, I watched this guy send over two hours with a Porter Cable buff out 1/4 of the hood on the Ferrari. He then took another photograph and blew it up on his laptop....swirl marks were gone. I saw this myself this wasn't a infomercial on TV.
You may not see the scratches at a glance but if you look closer you'll see them. Get
yourself a magnifying glass and try the same thing, it might scare you.
Now are some of us anal enough about our cars to do that, YES? But for us show car
guys who are always looking for a leg up it's just something to be conscious about.
To sum it all up use Adams Detail Spray and a microfiber cloth.