I used to use the turtlewax tub stuff on mine but it dried solid and was really hard to get off so I switched to Maguires, really easy to clear off afterwords and leaves virtually no chalky white residue when dry. The process and cloths really are the key to getting it looking good. Tesco do some really good microfiber cloths at a tenth of the price of the prof ones, they're great for applying polish etc.
Wash the car with Maguires gold class shampoo - starting at the top and working down to the wheels and arches.
Get a clean bucket of water with no shampoo and go over the car top to bottom again with a AutoGlym synthetic chamois - taking all the water off the car - just keep ringing the chamois and rinsing it in the clean water.
Apply the polish (I use Maguires crystal) using a microfiber cloth, circular motion seems to give the best finish. rub the polish into the paintwork until it's been absorbed
apply your wax (I use Maguires Gold Class) again small circular motions seem to give the best results.
Once the whole car's been done take the wax off with another microfiber cloth.
Give it a good rub down with a clean microfiber cloth to shine it up nicely
I then use a rabbits fur mit to put a really nice shine on for shows etc.