AMBxx wrote:

I take the lazy option and use Autoglym Aqua wax. Means that both cars are waxed at every wash rather than on the rare occasion I can be bothered with all the white mess. Makes the garage smell nice too (if you like the smell of banana angel delight).
Topped up with some liquid wax on the black areas (wheel arches and roof) for the extra shine.
Then once or twice a year I use a proper polish.

If you're using it to that extent try the trade version - Auto Glym express wax - same stuff but way cheaper