If you want to do a fairly deep clean to get it looking good again i would recommend:
Wash it over with megs shampoo and washmit...
Apply autoglym intensive tar remover over whole car... wash off....
Megs claybar and detail the car... this will remove any stuck insects or surface contaminents...
The wash whole car again with megs shampoo and washmit...
Rinse off... and dry with absorbant cotton terry towel...
Once dry use a polish - would recommend autoglym super resin polish as it removes minor swirl marks and gives a high gloss finish with minimal buffing... apply with an applicator pad and then buff off gently with a terry towel...
Then apply a wax... i use megs wax.. but i have just bought some zymol stuff to try... although i have only heard good things about blackfire products on black paint cars.... so you could try that
Then its just using wheel sealant.. bumper and trim restorer.. glass cleaner etc..
But that is a reasonably cheap way of restoring you car's paint without the need of a PC...
Hope that helps!
Alex