They need to make sure that mold isn't the dangerous kind. Those mold spores can be all in the air if they are disturbed. I did buy that mold control to kill the smells on those dresses for my friend. It works by wiping or spraying it on and letting it dry, then wiping or spraying again to clean off the dried up mold spores. I highly recommend gloves, long sleeves and pants along with a good mask designed to keep out tiny mold spores before they go messing with that stuff.
The product is called concrobium mold control.
http://www.concrobium.com/
The fogger is probably the best way to apply it in the attic.
http://www.concrobium.com/products/mold-control-fogger/