HELP

Hi! I'd like to know how to make that kind of cleaning. I've been trying but it's useless for me >XD
I mean... How to erase all those gray stuff from image 1 and make it only black and white like on the second image (is it possible with first image?). I'm using PS. Sorry for not beeing accutate in this description XP

From this:

IMG01


To this:

IMG02



Please, help me! Thanks in advance!