That Meguiar's Gold Class wash is siqnasty. Nice and sudsy. I use some random TurtleWax soap now.
I'm not a big detailing person. Other than the soap, I use Meguiar's cleaner wax & clay bar kit.
For the interior I use a microfiber cloth to pick up all the dust. I used to use armorall until I came to hate how shiny and oily everything was/felt. A microfiber cloth does an excellent job picking up all the dust and leaves nothing behind.