This is what it means if you find a “bleach” spot on your underwear:
it’s just your discharge interacting with the dye of your underwear’s fabric. “It’s the acidic nature of the discharge that creates these bleached spots on your knickers and so it’s more than ok, it’s a sign that your vagina is healthy!”
The Internet and the huge amount of information it offers are very useful tools for many reasons that anyone can list.