The bodies of Mr Cain, a father of one from Whitehill, and Mr Clarke, from Liss, were found in an apple storage area where nitrogen is used to preserve fruit.
At Auvil Fruit, an apple and cherry grower in Orondo, Washington, operations manager Walter Hough says the company used to lose up to 20% of its fruit to mold and spores as it sat in cold storage for up to eight months.