With the concerns of pests such as AFB, how can one be sure that old foundation recycled into new doesn't infect a recycled batch? I assume the wax would need to be heated to 300°F or more during reuse to kill off the AFB? It doesn't need to be heated to that temp to be made workable, so how do we know when buying foundation that it's not contaminated? With rising energy costs, I'm not sure anyone would heat a product higher than necessary to make it workable. Thoughts/ suggestions?