You do not need any special material to clean it. Most of the time, simply washing with water and drying it is sufficient.
If it is very dirty, or after washing nicely with soap once a day, dry it with a clean paper towel and continue using it.
1 nostril retainer is sufficient for routine use. However, if you wish, you can obtain a spare of the same brand and size against the possibility of losing or forgetting it.
Product Brand: ERFECEN®