We free range our little flock of chickens and ducks and we feed them away from their run on a sloping piece of ground that is earth and shale. We have been using it for about 5 years and would like to clean it somehow to get rid of any bacteria from their poo. Has anyone done this kind of thing and are there any suggestions what we should put down? We are in the UK so the weather is very mixed here - I don't think DE would work. Over to you my friends. Thanks!