U need 1small glassl2quarter cup of hydrogen peroxide3half cup of distilled white vinegar 4paper towel
combine hydrogen perxide and vinegar in a small cup or bowl
place your ring in the solution.
The mixture will not harm the metal or any stones that may be set
keep ring to sit in the solution for 20 minutes
remove the ring, rinse with warm water dry with paper towel
rpt this every 4 mths