Another last-ditch effort to lighten your dyed hair is to resort to Vitamin C. "Take a chewable vitamin C from your cabinet, or even the Emergen-C Vitamin C packs, and mix with water and a clarifying shampoo," says Los Angeles colorist Amy Huson (via Harper's Bazaar). "Leave the mixture on for 10 to 15 minutes."
However, if you've washed your hair more times than you can remember and tried a few at-home remedies but your hair is still too dark, it may be time to resort to buying a color remover (via PopSugar). Color removers are usually found right in the hair color aisle. After putting your hair through so much, it's important to nourish it with deep conditioners since the treatments can leave it dry and fragile.
Still, despite your best efforts, it may be wise to visit a professional colorist who can help you attain the color you want and also help prevent further damage.
