Hi, my dog has wee'd on my son's new bedroom carpet.  (Someone didn't close the stairgate properly).  I was told washing up liquid is really good .... but it's still left a big mark.  Any suggestions please????

My friend suggested BICARBONATE OF SODA with warm water helps. I did try it and the carpet looked much better!

Biological washing powder, works on stains as well as smells. HTH

And follow the bio washing powder up with a spray of some white spirit or white wine vinegar - the breaks down the fatty acids and prevents the dog coming back and re marking ;)