A simple guide to use these brushes to clean:
1. the large brush: water bottles (narrow opening brush like S'well bottle), vases, mason jars,
2. the medium brush: baby milk bottles or pacifiers, beer bottles, soy sauce bottles,
3. the small brush: kettles, cans, jam jars,
4. the cotton straw brush: glass/steel straws or delicate surface surfaces; and
5. the sisal straw brush: bamboo straws or surfaces with tough stains.