I just scored a 75hp merc 2/ , not to sure of the year but about 2000 ish .
Anyhow , long storey short ( for a change

) , this thing was last run 2 years ago , in salt water , taken home where the decision was made to not use it any more and it was parked without any flushing ( apparently the PO was quite diligent up to this point ). Fortunately a son in law had the presence of mind ( some time later ) to make up a stiff brew of fuel and started the engine , without any water and choked it to death with 2/ oil .......and the bore scope sez he did a good job .
I want to run it in a tub full of something that will dissolve the salt and any corrosion . Id be happy to run it for a day if it works
What is the best stuff to use ( I am Kiwi so I will at least double the recommended concentration

).
I wish I was young again .... Id be heaps smarter than this time