Indeed, the energy cost of machine-washing glass bottles is surely an order of magnitude less than that of recycling the broken glass into new bottles. However,

Indeed, the energy cost of machine-washing glass bottles is surely an order of magnitude less than that of recycling the broken glass into new bottles. However, I don't think you can replicate that with aluminium cans. They preserve their contents better than glass bottles do, so glass bottles can't necessarily replace them. The seal of aluminium cans also breaks when they're opened, so you can't directly wash and reuse the cans.