Leaving your boat locked up in the tropics? I’m not an expert; but having closed up and left our boat in the tropics. Twice, once with grim consequences, and once with excellent results, I feel I can impart a small bit of wisdom to those, who like me have, or are, battling mould, cockroaches, spiders, and ants. We left Thorfinn, our beloved home, in Langkawi up a river at a place called Hole in the Wall, for six weeks. When we arrived back we were confronted with a boat brimming with mould.