Yes thanks guys, I should have remebered the fresh water thing as a first action . I will still do it as water shoud still desolve any residual salt albeit over more time.
My comment about oil was really more about the way that the 'normall oil' in the bilges gets everywhere. ( In fact there was quite a bit of oil in the bilges due to pin hole leak in the oil filter, I had intened to clean this up on my visit but the leak had distributed it throughout the bilges)
Thanks again