2, Soak in diluted vinegar for 30 minutes, you can shine as new.
3, take a piece of cloth with a long thin wire tie, through the straw, the cloth can be pulled back and forth to clean.
Wash straws with table salt.
Salt has the effect of disinfection, when washing the thermos cup rubber straw, you may wish to add a small amount of salt, and then pinch the straw with your fingers to rotate, after cleaning with water, yellow dirt will follow the salt flow away, so as to achieve the role of cleaning. You can use a slightly larger hairpin, choose a piece of wool about the size of the straw, pass it from one side, and then pull the wool back and forth, so that the dirt in the straw can be removed.