We have just bought our lovely new house and I have been enjoying sorting out the very unkept garden....until...in one of the borders I discovered a dog toilet hidden behind a bush. It absolutely stinks of dog poo and appears to be buried into the ground. DH thinks we need a toxic waste specialist to take it away - combo of chemicals and what would appear to smell like 20 years of dog poo. We don't have a dog, so obviously it's completely unnecessary. Any tips on getting rid?