So, while exploring further in the "warehouse" that is our newly acquired property, we discovered a waterbed in one of the upstairs bedrooms. There has already been a ceiling collapse from a bathroom leak and we certainly didn't want another, so we decided to drain the mattress. Establishing a siphon turned out to be a bit harder than we expected because there was no running water in the house. Finally we ran a garden hose from a faucet on the side of our house, over the fence and through the upstairs window and backfilled the mattress then disconnected the hose from the faucet. While the mattress drained we sorted through the pile of clothes on the bedroom floor, throwing away socks, underwear and butt-torn jeans; there were 4 pairs of like-new khaki Dockers in my husband's size. Alas they are pleated and cuffed; don't even ask.
A neighbor who has done restoration work came by to see if we might like some help. After a thorough walk-through, he confirmed our thoughts that our BIGGEST job will be cleaning the house; structurally it is pretty sound. No problem -- after all, there are cartons of cleaning supplies scattered throughout the house.