How do I get handprints off my car's paintwork?

I have a light silver BMW. It's parked on the street and the neighbourhood kids seem magnetically attracted to placing hands on it as do passers-by stopping to talk to each other, leaning arm prints on...

Can you recommend a car polish to protect the paint on my new car?

I have just purchased a Subaru XV. I was offered body protection at a ridiculous cost. Can you recommend a polish to carry out the protection myself?

Is Supaguard worth buying through a dealer?

I'm due to pick up a new Honda Civic within the next fortnight and the dealer has asked that I consider treating the paintwork and fabric with Supaguard. As the car is being purchased under the Motability...