Reducing the load of pathogens in the environment of your flock will decrease the risk of disease.
Disinfectants are chemical agents that can kill pathogens on contact.
Cleaning prior to disinfection exposes the pathogens to the disinfectant. Remove all bedding, feed, and manure. Sweep out loose dirt, cobwebs, etc. Apply the disinfectant. Allow the disinfectant to dry completely.