Our cat Gracie was just blessed with a liter of kittens.  It was an experience my family will always remember because she birthed them right in our living room.  My carpet will never forget either as it seemed permanently stained.  My husband and I spot-treated and took turns scrubbing, but to no avail.  We could not lift the stains.  We finally gave in and called Rug Cleaning Manhattan, a professional carpet cleaning company that we found online.  The team that came out was very friendly and once they sized up the situation they went right to work.  The finished product was amazing!  We now have 4 healthy kittens and very clean carpet.