can anyone help me

My Bear (dog) (shih-tzu) has at some time piddled in my spare room, and I havent seen it until today when I smelt it....YUK POO!!!!!.

It had dried and all I could see was the outline of the original "wet spot". very strong urine smell

I have cleaned it with carpet cleaner and also have sprayed around room deodoriser to no avail :(

Are there any "home remedies" I can try??

thanks in advance...all suggestions, except getting rid of Bear, will be considered LOLOL