Removing Mold and Mildew from Leather Tack -- Permanently

You've forgotten to clean your your $3000.00 saddle and left it in the tack room way too long.  Now it's covered with a lovely layer of slimy green fuzz!  What do you do? Leather experts often lament the inability to permanently remove mold and mildew from tack and other leather goods, once the little green buggers get a good toe hold.  The mold spores lodge deep down in the pores of the hide, making it extremely difficult to remove.