What needs to be done with an outdoor hutch that has been sitting unused for several years before using again?

we has a rabbit who died 3-4 years ago. The outdoor hutch has not been used since. We now have 2 new bunnies 4 1/2 months old. What do we need to do to get the hutch ready for them as far as disinfecting, etc. It is a wooden hutch off the ground with one side enclosed & other wire front & side & wood back. Wire bottom, too.