Allow the carbonation to eat at the stain and then blot it with a cold rag until it is completely lifted.
Club soda - The carbonation may minimize the permanent staining, but it will only dilute the stain.
Even without the carbonation, root beer and orange soda make tasty summertime treats.
If you like a little carbonation, add a splash of lemon-lime soda to top off each glass.
Buy small, individual serving sizes to ensure the carbonation doesn't quickly dissipate, which is common in the large economy-sized bottles.