The boat is a 1990 and as Faster said, probably a cocktail of fiberglass, head and other odours. Hellosailor, I think you have it figured out. Clean clean clean, eliminate possible sources and ventilate well and often. This is a new experience for us and maybe this boat aroma is something that goes with the territory. Interesting that while we were having the boat surveyed I asked both surveyers and the broker about the smell. All replied "shat smell". Anyway, thanks for the advice All. We are spending Xmas on the boat and I'll bet we will spend considerable time scrubing bilges and bathrooms. I'll let you know how it goes.