There's a product called X-14 that is the best mold remover I've ever used. Much, much better than bleach.
Make sure you try it on a small area as a test first. I have used it on many materials, but not nylon (assuming that's your tent type).
However, as of this writing, all smaller bottles have been recalled in the US. You can only buy it in the gallon size....
Summary of answer on Wikihow:
Clean the rabbit leg by washing it in soap and let it dry.
Soak the leg in 70% isopropyl alcohol for two full days and rinse thoroughly.
Soak the leg in 1 part borax to 15 parts water for one full day and rinse thoroughly. This will dehydrate the leg.
Allow the foot to dry for about a day.