Critiques so far + a way to clean foam?

Sorry for the many submissions lately. ;o;

So, I'm working on my 4th mask, a cow. Does it look like a cow to you? P:
Also I have questions about cleaning and disinfecting foam.


Image may be NSFW.
Clik here to view.
Image may be NSFW.
Clik here to view.
Image may be NSFW.
Clik here to view.

This mask has a moving jaw. Ignore the eyes/eyebrows, I drew on my mannequin head because I'm getting a cfx head tomorrow. ;w;


Now, about the foam. I have some not-so-cheap high density green foam (as seen on the ears above). I have a large sheet of it, which I recently discovered was... soiled. The cat threw up on it, and somehow ended up all over the middle of this foam sheet. Luckily I had some big scraps I made the ears from.
Is there a way I can clean and disinfect the foam sheet? Or should I just waste it? ;-;