With daily use, the straw accumulates a sediment that could cover it and even alter the flavor of the infusion, so it is essential to incorporate proper hygiene of the straw into the mate habit. Also, german silver straws tend to darken over time and require polishing to restore their natural shine. Here are the steps you must follow to make your bulb look as bright as the first day: 

1. In a pot, heat water with a tablespoon of baking soda 

2. Add the straw and boil for 5 minutes 

3. Remove the bulb and let cool 

4. Polish the bulb with a metal cleaning ointment 

5. Rinse the bulb with plenty of water to remove all toxic residues 

Done, your straw is ready to be used again!