I got a black 02 S60, and I was wondering the same a few weeks ago. Last weekend I went out and bough the meguiar's smooth surface clay kit and meguiar's gold class paste wax. I washed my car first, then went over the entire body with the clay bar. After I was done with the clay, I ran my hand over the paint and it felt smooth as a babies behind, im not even kidding, i was amazed at how smooth it had gotten. Then I whipped out the wax, went over the whole car by hand, took me about 30 minutes. Let it sit and dry for about 20 minutes, and then wiped it off with a microfiber towel. I did all of this in my garage to keep the car out of the sun, so when i was done i rolled it out into the driveway. When the sun hit it, I was amazed. It was reflecting everything around it and the paint was just shining, it literally looked wet. My 7 year old volvo's paint looked newer and cleaner than the brand new volvos ive seen at the dealer while getting my car serviced. I would recommend doing exactly what I did, you will get tremendous results. The wax also protects against rain, i drove through rain last night and when I got home there was not a drop of water on the body, it was beading like crazy!!! I got all of this for around $50 and about 2 hours of work, but it was well worth it.