This patent seems to suggest that hydrophobic coatings on reusable drinking straws are a thing. They apply it to make the straws easier to clean for reuse. http

This patent seems to suggest that hydrophobic coatings on reusable drinking straws are a thing. They apply it to make the straws easier to clean for reuse. https://patents.google.com/patent/EP3738479B1/en https://patents.google.com/patent/EP3738479B1/en