US soymilk producer White Wave has expanded a recall of soymilk because of fears that the product may be contaminated with a caustic sodium hydroxide-based material used to clean manufacturing equipment. The Boulder, Colorado-based company said it was recalling 360 packages of the Vanilla Silk branded milk, which was sold in Sam's Clubs stores in Alabama, Florida, Illinois, Indiana, Louisiana, Michigan, Mississippi, Ohio and Texas. The company had already voluntarily recalled 25,000 cases of half-gallon Vanilla Silk soymilk sold throughout the US.