I like Griot's Best In Show liquid carnauba wax. It goes on easily. Comes off without much trouble.

If you keep the car outside during the day, parked while at work or whatever, drive in a lot of bad weather maybe better to use a polymer "wax" instead of a carnauba wax.

C wax is more fragile and requires more applications.

carecareonline.com has some good essays explaining everything.

Oh..., avoid silicone-base products.