I've used and still own a heap of car cleaning products and for cars with a good paint job I personally can't tell too much of a difference between the high end stuff.
I keep coming back to what is easy and quick. As much as I like touching my car and seeing it all nice and clean - don't we all? I an;t got time to waste on drawn out washing procedures.
So here's what works for me -
1. short once a week type wash...
Spray the car with a light jet hose gun to remove surface dirt and get it all nice and wet.
put 1 cap Meguiars soft gel wash (comes in bulk 4l) with half a cap of truck/4X4 wash (called something '10', CBF going the garage and looking), in standard bucket and wash with wash micro fibre mitt.
Then take the gun off the hose, turn to low pressure and just wash off soap, let the water pane off the car, no splashes. This rinse technique alone will stop most of the water marks when drying.
chamois if you wish, well at least do the widows...
2. longer detail... do no.1 then
just apply Meguiars NXT Generation Tech Wax - wax on wax off. Easy no orbital buffer required.
3. Quick detail in between wax jobs..
no.1 then just use Eagle 1, that's right the stuff from K-Mart spray on detailer. Can't remember the name comes in a blue bottle. This stuff works as well, if not better (as it is easier to apply and doesn't need any curing time) than Mequiars spray detailer.
These is the quickest and cheapest way to get your car to show standard... Obviously clay bar bits that are really dirty, but if you wash it regularly enough it should be fine.
Scratches - Mequiars scratch remover - black tube or this amazing 3M stuff for boats, fibreglass - expensive but great, again CBF going to garage to look at the name.
NOTE: don't use any of the above on carbon fibre. Just use water and chamois on c/f. Meguiars do have a gel wash made for boats which I've found OK for c/f
FW1 is good for removing carbon build up on bar around exhaust or rims or clearing plastic head light covers - wouldn't use it on anything else. Thou it does a great job of cleaning soap scum off of glass in the shower and keeping it clean. A little too harsh for paint work IMO.