The wife and I are putting our cars up for sale. By that I mean the Suzuki X90 and the Audi A4. In prep for that, I need to get them looking fantastic and photo ready. So... my washing/wax technique is very basic: whatever soap I have around, whatever care wax is on the shelf, whatever rag is available. But I sense that I am missing some critical info. So without spending hundreds on arcane products, what are you top tips, products, techniques for turning a slightly dirty but decent paint condition car into a shining example of poster ready automotive excellence? Particularly: do I need a clay bar? Do I use a light rubbing compound? Are most waxes sufficient? Do I need an orbital polisher? What about rims, especially alloy rims?