yep the degreaser is under the name 'wheels and tyres' but i spray the whole car with it. haven't had any problems.
degreaser>high pressure wash>rinse seems to work fine for me considering i never even touch it with anything except pressurised water.
if i do a real wash (once every 6 months or so) i do the same at the carwash but use a sponge on it before rinse, then just come home and either let it dry or dab up any drops with a towel, then i wax it up. vwa lah.
shaun, you sometimes see 4WDs come in totally covered in mud and use the brushes. i wouldn't use it after that