There is a simpler product out there I've used that you "inject" into the evap. box.
I wish I could remember the name. You would find an area free from the evap or anything else important in the box then drill a small hole. Then you would inject this pressurized can of odor remover/mold killer into the hole, run the a/c in recir. and plug the hole after with a rubber plug provided. As I remember it worked so well we never pulled evap boxs again for that complaint. Try doing a seach on goggle and I'll post the name of it and where u can get it if i can find out.