Quite simply clay is FANTASTIC! (imho)
It leaves the paint feeling like glass
BUT!!! if you drop the bar on the ground, BIN IT!
It will pick up the dirt and if u continue to use it on your paint,
it will screw your paint up! the marks left will look like someone has rubbed your paint with a brillo pad!
I use megs, before i start i cut the bar in half just in case i do drop it!