C.O.
baking soda will/SHOULD absorb the smell..
vinegar and water SHOULD clean it...however after googling how to get milk out of microfiber....this is what I got!!!
http://www.ehow.com/how_###-###-####_clean-dried-milk-mic...
If you paid by credit card - you might be able to call the credit card company and ask them for a copy...also since it's been less than 2 years - call the store that you bought the couch from and ask for a copy of the receipt...most stores keep records for 2 years...