Hello mate i have just got my paintwork back up to scratch supprised how easy it was.
Start buy giving it a good wash use one of the meguiars shampoos, then go for their clay aswell it is really easy to use and really good results you can do this without even dryinrg the car after washing but i did dry mine of and use the quick detailer to lubricate it.
The next step is to use their paint cleaner followed by either the gold class wax or tech wax.
Mine really came up well paintwork feels like glass its all expensive stuff but really good, hope this helps you out sa bit.