get the meguairs 3 stage kit, which is :
Polish (takes a fine layer of the clear coat off slightly abrasive)
Paint cleaner (takes away oxidisation)
Wax (protects)
the meguairs gell shampoo is good also, all should be applied with a foam applicator not an old t shirt, then buffed off with a microfiber or terry towel, u should do all 3 every 1-3 months and just a shampoo and wax avery week, and as people said misting filtered water over the paint the next morning and buffing it off helps alot, but a mist should be just that u shouldnt be able to see it and should just lube the serface slightly.
always apply and buff in straight lines follow the way the air will travvel over your car.
remember a wax is a protectant and a polish is just that a polish slightly abrasive, they will come in hard waxes and polishes and liquid also, the zymol from halfords is not zymol its turtle wax badged up as zymol, turtle wax isnt the best stuff in the world, meguairs and some others are some of the best....
http://www.seriousperformance.co.uk/http://www.seriousperformance.co.uk/ is the best site to buy stuff from and if u email them tell them what u want to achieve they will help u, belive its summit to do with some 1 from here.