Summary This column is the second in a series intended to spur innovation in the parts cleaning industries. My goal is to present readers with technology proven in non-aligned industries and urge them to consider its potential for use in parts cleaning work. Last month's column, for example, introduced the concept of cleaning with steam. This column covers heat wheels—a non-intrusive approach not to cleaning per se, but to managing the energy costs of cleaning processes. There is little or no technological risk. Heat wheels may just save you some money-and, if you don't dry parts with non-evaporative technology, it may save you lots of it. So I would ask the question: Why isn't everyone using them?