Leather Sleeve Case

iPhone and incase question?
I got an iPhone 3G and incase case for my birthday. I love it, but I got the pink one so it is getting dirty after a few months. Is there any way I can clean it without damaging it because it is partly made of leather. Mainly the back of it.
Here is a pix:
http://www.goincase.com/products/detail/neoprene-sleeve-cl59049
Please, any suggestions will help.
Thanks =)
soap and warm water should do the trick, just be careful not to get the whole thing wet
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