Marko Bewersdorff wrote:

This is just theory, brain storm or brain fart - you're the judge.

One thought: Flush with a solvent that binds with water, and evaporates
easily, and that doesn't eat up the internal seals.
So perhaps a flushing with denat. alcohol or avgas prior to blowing the case
dry with compressed air will remove a lot of water.

Alternative two. Take the engine case into a sauna and let it heat up for
long enough so that steam escapes.
All right alternative 2 wasn't that serious.


Memory is fuzzy on this one but I recall, running pure antifreeze is a
corrosion problem.

Marko

How about leaving the plug out and sticking a hair dryer into a different hole?  Support it, set it to a moderate setting and leave it for an hour or so.  Temps not too hot, but sufficient.