A: Regular cup use can cause stains on your cup. These can be removed by placing the cup in a glass or container with hydrogen peroxide (3%) for at least 8 hours. Don’t do this too often and limit it to a maximum of 3 times a year.
A: Regular cup use can cause stains on your cup. These can be removed by placing the cup in a glass or container with hydrogen peroxide (3%) for at least 8 hours. Don’t do this too often and limit it to a maximum of 3 times a year.