How did you try Scratch X?
Did you just use a Micro fibre cloth? Sponge Applicator? Did you put some elbow grease into it? Use a Buffer.
Scratch X will take out a lot of things if used correctly. It's an abbrasive that diminishes with application. Meaning, the more pressure you apply the better it works, if you wipe it on and basically just rub it off, it ain't gonna do anything but make you frustrated with Scratch X.
http://meguiarsonline.com/forums/thread/13494.aspx
Pictures would be useful too. :)