Black cars don't stay black for long, if you want to keep them looking their best you'll need to wash it regularly.
I use meguires car shampoo and dodo juice wax but it really needs a proper polish as it's got a fair few swirl marks on it.
I know this says subaru but it'll give you an idea of what level you could take it to if you want your car looking tip top.
http://bbs.scoobynet.com/car-care-38...t-subarus.html