Getting "stains" out of the carpet?

Can anyone recommend a product for getting p00 marks out of the carpet (cream coloured just myluck ). I have cleaned it with VAPET "get off" spray but there is some staining still there. Someone couldn't hold it long enough for me to unlock the door she seems to have an upset tummy

Can you use biological washing powder? That should lift the stain and the smell as well....

Thanks for the suggestion. Ive only god liquitabs(sp?) now but ill buy some powder and try tipping some on....smells lovely at the moment

I'd mix a bit of the powder with some warm water, then gently rub it in with a cloth/sponge, and dry off with a tea towel