In these hand blown glasses, using their signature "Avant-Tech", the liquid travels from an opening in the bottom of the cup through the designs within the walls up to the straw opening. The inside and outside of the glass are smooth and the passageways are inside the walls!
A hot water rinse and flush right after each use does wonders for a super quick clean. You can also just wash like you would a normal glass with hot soapy water and run water into the straw opening for rinsing the straw passageway. If you don't rinse right after each use and a drink dries inside, simply soak in hot soapy water for a few minutes. You can do an easy deep clean with an isopropyl alcohol flush and add salt if you need a scrubbing agent. Shake and/or sit in the sunlight to dry completely. The great thing about glass is that it can be easily sterilized.
