I first came across Corrosion X in Trinidad and after years of thinking there was nothing better than WD40, I was really impressed. There were two grades as I remember.
Recently I discovered another product Boeshield -T9 which again has had good results, particuarily on plug in cables, chart plotter,radar,etc.
Unfortunately I have not been able to source either of these products in the UK when you do find them on line they can't be airfreighted to Ireland.
Sea Fever of Cuan