Lil 'Aty - I echo your comments about swirl marks on black cars.
The last three Mercs that I have had have all be black (well two of them black and one blue/black metallic)
Black is without a shadow of a doubt one of the hardest colours to keep clean and scratch free. That is not at all true, it is just that we notice dirt and scratchmarks a hell of a lot more on this colour of paint!
The problem that you are noticing is because the paint surface is either damaged or has not been finished correctly. Not as serious as it sounds, and sp!ke has already hit the nail on the head.
The scratches/swirling in the paintwork have to be removed before you start waxing/polishing your car.
You could wax it with autoglym resin polish 20 times and it still wont take out all of these scratchmarks!
If you have the time, resources and patience then I recommend a long weekend effort of thouroughly washing the car and cutting the paintwork back to remove these surface scratches. Ideally for the best results I would wash the car twice and try and find somewhere well covered (ie, a garage) to stop any dust/dirt from ruining the job.
work your way around the car and do only 1 panel at a time. If you are doing it yourself with T-cut or similar, be prepared for some hard work!
If you are intending on keeping the car, and you really want a top notch job, find a specialist valeting company and get them to finish the paintwork for you correctly. It may cost you, but trust me, you will not be disappointed. The secret is that insted of "filling" the scratches up with a layer of wax, you really want to remove them properly first. How many times have you seen cars that look pretty good when they have be waxed to buggery, and then after 3 or 4 washes, appear to look a little dull and lifeless, and covered in scratches?
If you were to have the paintwork compounded first, and hence remove the majority of the scratches, it will pay you dividends in the long run.
Personally I am not a huge fan of T-cut. The best results that I had were on my previous 190E. I used a combination of G3 paste and Gold Top machine glaze, both available from farecla (
www.farecla.com). I meticulously applied these using an electric polishing mop and a lot of time/effort. Everyone that I knew was stunned with the result - I am not exaggereating when I say that it stood out like a new pin! It took me about two days to complete the job but it probably save me endless weekends of wasting my time trying to polish a scratched car!
These are professional products, and I doubt you would find them in your local Halfords etc, but if you can get hold of them and know what you are doing, the results will be worth it.
Just remember that although a black car requires a lot of upkeep, when they are looking pristine they dwarf everything on the road! It really is a labour of love!
Good luck
Will