you can try oxi clean it is supposed to get rid of pet stains and is a very versatile cleaner when mixed appropriately.
I have used it on pet stains on carpets and all sorts of other stuff, including, getting oil off my driveway that spilled when changing the oil.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.