Ideal World sell a thing called Showroom Shine it is amazing, I have had a BLACK fiat stilo since last summer. Part of my job involves valeting vehicles, so i have free accress to any type of polish and cleaner you can get for free, thus i had the most shiney waxed car about

.
I used to use auto glym polish then there high deff wax (which at £30 or more but good)
Then i found Showroom shiney and saw the advertisment where they clean a dirty bit of paint by jsut spraying a thin mist of it on and then wipe of off with a cloth!!! no water nothing!!!! i was not convinsed by this so i jsut moved channel, few weeks later my mate (who is a clean freak and does car touch ups) shown me this bottle of showroom shine and started cleaning my bonnet. i said to him what are you doing, you will grind alll grit in, but when he wiped it off. It was perfect and not a mark on it.
I ordered a tripple pack of this and it is perfect for cleaning and putting a prottected shine on your car. you just spray on, wipe in, let it dry then wipe off. I jsut work my car quickly around the car and by the time i work around it is dry so wipe off.