Hi,
I tend to use a lot of different products on the car. I use Turtle Wax Zip Wax Shampoo for washing the car. I really rate the Turtle Wax Glass Cleaner. I'm surprised about how much extra crap it gets off the windows even after washing! I then use a lot of Auto Glym products too. I use Clean Wheels on the alloys and Instant Tyre Shine on the tyre walls. Auto Glym Alloy Wheel Seal is also good to spray on the inside of the alloy. It helps to repel dirt and brake dust but is a bit of a hassle to apply. You have to remove the wheels from the car as you don't want to get this stuff on the brakes!
For the interior its all Auto Glym again. Leather Cleaner, Leather Care Protector (which can also be used on interior and exterior plastics and vinyls with fantastic results, and better than silicon dash sprays I've found in my experience) and Interior Shampoo for the carpets.
I've only recently got into the Meguiars stuff, recommended to me by people I work with. The only down side to the 3 step system I used was the length of time involved in applying the product. I suppose its worthwhile though if you're only using it a couple of times a year though.
My wife thinks I'm absolutely obssessed with cleaning the car. I only wash it every 2 weeks or so to keep on top of it all. I find it strangely theraputic (now I do sound sad!) but I do get a good sense of achievement on the results.
Ben
