Lots of good suggestions for proper wash technique offered up already (I'm a foam gun user myself - love the darn thing!!) and good suggestions for waxes, polishes, etc so I'm going to leave those alone here, with one exception:

Turtle Wax ICE. Of all the products mentioned and all the products I've played with over the years, this is the ONLY product that I just can NOT recommend. I hate to see people spending money on this stuff. If you like Zaino, Pinnacle, Meguiar's, Mother's, P21S, Zymol, Liquid Glass, NuFinish, Rejex, Dodo Juice, whatever, fine. ICE is just a total waste of time and money - it washes off, it doesn't give that nice slick finish, shine is so-so at best. It's probably the single worst paint care product I've ever come across.

As for when to clay and when to paint clean...... sorry Pat, but you really should clay first. Think about it: clay only works on above surface bonded contaminants, paint cleaners (ScratchX, etc) only work on below surface defects. Therefore it makes sense to get rid of the crud that is stuck to the surface of the paint before trying to correct defects below the surface. Otherwise you're trying to work through those bonded contaminants. Granted, if you don't have heavy contamination then it may not make a huge difference, but if you can feel the crud on the surface, why risk pushing it around while applying a paint cleaner? No, best practice overall is to clay first then paint clean.

A rare exception to that rule is when working on old, badly oxidized single stage paint. When a red car looks more pink and white than red, a good paint cleaner will remove a lot of that surface oxidation and take much of the contaminants with it. You would then quickly clay to remove the remaining deposits and then go back and do your final paint correction. But how many of us are doing this sort of project on a regular basis?