I have some bird mounts (waterfowl & gamebirds) that I mounted many (8-9)yrs ago. Went through a divorce and the mounts got stored in a dirty garage for 3yrs. I tried to search, as I know this has been asked before, but I never could get that to work for me. Tried blowing w/air compressor and light dust did come off but feathers still look dirty. If I submerge them in water and wash won't the skins re-hydrate? I really want to salvage these mounts if possible so Thank You in advance for any advice given.