oh!!!! that is horrible

if you take out the piece of wood, possibly cut around it? if you left any linens , curtains etc. you can, without Bleaching them and ruining them, use 1/8 cup bleach in the washer for a full load and wash that will kill any mold spores that have gotten into them. then wipe down the whole cabin with a mixture of 1/4 bleach to a gallon of water . Mold spores get into the air so wear a mask and wash down everything. That looks like black mold

and we don't want anyone sick.I am aware there are other chemicals that will wash away the mold but bleach is the most inexpensive and i know it kills mold,bacteria and doesn't harm pets and people. Clorox and water will lose half its strength in 3 days, Clorox is chlorine and will become a gas and will evaporate out of the water over time. Just some shared info I learned. I hope you can clean it up!!!
Mary C.
