I am thanking Manie B for the suggestion of cleaning with vinegar. However the vinegar is an acid and the epoxy hardener is an alkaline. The two react with each other. The harm will probably be minimal but when I discessed the issue with my epoxy chemist he did not like the idea. Insted I have dried the inside of the hull and am grinding the Divinycell down to un-contaminated core, just in case.
To be continued…
Regards Yrvind.