Sanitizing donated coop

[stumpknocker]

My former neighbor face up on chickens and has offered us his coop. We want it but I want it sanitize it first before exposing it to chickens. What should I use that is safe an effective?

 

[DavidKerk]

I've always been advised to bleach and then rinse with water. I've heard 1:3 bleach to water OR 1:10 bleach to water.