Firechief,

Try a product calle Mirazyme by McNett - as someone else mentioned, it's enzymatic - uses microbes and enzymes.  I've used it successfully on foul smelling tents, sweat stained packs and dry bags - even worked well on my "trash kit" dry bag that gets all the garbage from the trip - keeps the mess and smell from everything else.  It' says it safe for almost anything and it beats peeing on stuff...except snow.  It runs about $4-5 for a 2 oz. concentrate bottle.  If that don't get it out, maybe you should re-gift it!

portage dog