I used the HG spray recently on bathroom tiles and it's awesome ... but it's effectively just highly toxic chlorine bleach. Can't imagine it doing your wood any good, as you say. Perhaps ventilation on its own will eventually cure your problem? I had a kitchen cabinet with a water leak that soaked through the wall behind it -- got pretty whiffy with mould, but after curing the leak I just left the cabinet door open for a couple of months and it mostly righted itself.