That is more expensive due to energy requirements over simple washes, but if the energy used to do that is renewable then that isn't a big deal. I think the big problem with autoclaving the glass is the time required for heating up and cooling off as thermal shock will break glass. That said, breaking more glass isn't a big deal because it is an inert material. And the sorting and cleaning of glass should be easier and cheaper than ever thanks to better automation and robotics.