You're not really have to find "clean" crack brushes. Put them on a transparent layer and clean them with a lasso tool.
I know...actually these cracks were putted on transparent layer in PS...but there are many "dirty" point and line distributing mussily...if "clean" them,this brush lose it's true meaning...
Still not "shiny" enough. It doesn't even look like glass. *sigh*
Vegas??sugeee!!!
I set all layers as 3D layer in AE...add a point light...and turn intensity to 120%...may be I need turn up each layer's reflection parameter...
Ummm...need a further "research"...>_<