Let's have a look at WHAT A WHEAT vs GLASS STRAWS. pro and cons Glass straws are an excellent solution at home. You can reuse them and scrub them every time. Like every reusable straws, in restaurants and bars they pose a massive hygienic problem since the glass straws should be scrubbed internally every time while getting washed. Dishwashers are unable to clean the metal straws deep inside. Think about getting some leftover pulp in your mouth from someone else smoothie. Yuck