I used Zymol carbon wax on my wife's black 525i. Actually, I use the whole
Zymol process consisting of Clear car wash, HD-Cleanse polish and the wax.
The car has a deep mirror like shine that holds up well with minimal care
(weekly washing). You can get it from www.bavauto.com .
Black cars in particular show off every water spot that gets left behind.
One thing I found that really helps with water spots is to make up a filter
for the hose that you rinse the car with. Home Depot sells one for about
$30. The pipe thread to hose fittings are about $7 and if you need another
short hose to run from your house to the filter another $5. So all together
under $50. Removing the sediment from the water before it gets to the car
makes a world of difference in preventing the spots from forming and as a
result makes drying the car easy.
As per what Kyle says but I use Meguirs and have had great results.
Personally I find the cloth used can make quite a difference. I tend to use
generic microfibre cloths and have no complaints but then my cars are met.
silver and met. blue. Black is a whole new world of (rewarding) problems ;-)
I like Zymol as well, and have since my Porsche days. Expensive,
but worth it - give it a try.
As for the keying, buffing won't help if they went through the
paint - you'll need it touched up. Try a mild polish and see where it
gets you - lots of times is just the metal of the key on your paint.
2003 BMW 325i Black/Black
2003 BMW Z4 Black/Black
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