We have an absolutely awful stench coming from god knows where.
Hoping someone here can give us some guidance.
Here is what we know and suspect.

The aft bilge (not the engine bay) had some standing water that seemed to be the source of the smell. Hosed it out and scrubbed it using some bilge cleaner. Smell still there.
The engine bay seems to be seperate and not connected to the bilge area of the cabin. Engine bay bilge smells fine.

The toilet is the pump style with electric assist. We think the seal at the bottom of the bowl must not be sealing properly since water does not stays in the bowl. Or perhaps the tank and hoses may be due to be replaced?

The smell is just about everywhere but seems to be the absolute worst under the v-berth. When you open the access door you almost want to pass out.

Any help will be greatly appreciated.

Thanks