M_Boats: mystery smell

I have been cleaning up my M15 and when I opened the storage area under the V-berth it really smelled. I pulled out all the styrofoam and began scrubing but it still stinks. I wonder now if it is coming from the styrofoam under the cockpit. I don't see how to remove that foam. Has anyone else had this problem. How do I deodorize the area below? I want to be able to sleep in there and I don't think I can. Thanks. Dan Mostue M15 #500