ok ok ok, im the type of person...that prefers to wash/clean/detail my own rides...i trust no one but myself when it comes to making my rides clean, shiny and sleek :-) so therefore i do em all myself!
honestly, the best product that ive used so far out there that have worked best for my C32 AMG (Black Opal) and my Fairlady Z (Silver Ice Metallic) when it comes to oxidation/swirl marks/water spot removals would be:
Meguire's Ultimate Compound (Heavy Oxidation/waterspot/swirl mark removal)
Meguire's Clay Bar (Waterspot/light to somewhat heavy oxidation removal)
seriously these two products partnered with each other works best for me! for both the black benz, to the silver Z...
When i first got the Z and same for the AMG, the hood were heavily oxidized...so bad that on the benz, you can see the white oxidized spots on the hood from many angles, during the day, especially when parked inside the garage with the flourescent lights on.
On the Z, you cant really see the oxidations direct head on when looking at it, but when you run your hand across the hood, you can feel rough spots...and when you look right against the hood at an agle, you can see the oxidations...which is sad :-/
so i played around with trying to get these things removed without having to spend $$ on detail shops and with the first two products that ive tried, the Meguire's clay bar, and ultimate compound, with hard work, dedication, and loong hours of rubbing and rubbing and buffing and buffing ALL by hand, OXIDATIONS/SWIRL MARKS/WATER SPOTS and Dull areas on the paint...seriously ALL disappeared and even restored the shininess of the paint and seriously moisturized the clear coat!
OFcourse, you finish it up with a complete car wash, and then top it all off with Meguire's Ligiuid Gold Class wax! works best aswell with the Z and AMG :-)
so the point is, stop relying on other people, services, and spend $$$ on something you can easily do your self as long as you give it some dedication, TIME, and...TIME..and patience
...because in the end, you feel great about what youve done especially when you see the difference youve made to your beloeved car's paint :-)
just thought id share! thanks for reading!

 

With sufficient knowledge, the correct methodology, quality products and the correct polisher and sufficient experience surface blemishes can be easily removed by an enthusiast or professional detailer