I sued to 'pickle' all the time with muriatic (hydrochloric) acid ...
you can remove a fair amount of engine base metal if youre not careful.
Muriatic pickling does remain a valid process - just be very careful.

Mr. Catfish wrote:

Thanks, I will pickle the engine, I got a copy of Good old boat yesterday
and they have an article on cleaning out raw-water cooled engines using
muriatic acid. Same technique would work with marsolve.

George Pappas
S2 9.2A "EXO"