Marcella, unfortunately I don't know what you can do with a finished drum short of putting a different skin on it. You could try smoking it real good.
I have seen and smelled drums made with stinky skins before. They get especially smelly if you take them in a sweat. I was in a sweat where the leader sent that drum out of the lodge and told the person not to bring it in the lodge again.
If you are going to use plain water to slip hair for rawhide you have to really pay attention and keep the water from getting sour or you end up with smelly rawhide. Most of the time it's not too bad if it's very dry but in damp conditions the smell comes out.
"The world needs both perfume-makers and tanners; happy is he who is born to be a perfume-maker, woe is he who is born to be a tanner."