Speaking with Galore Mag in 2014, actress Dianna Agron revealed her must-have products for blonde hair maintenance. "To maintain my blonde locks the purple shampoo is key. And there's this detangler brush from London, it's genius. It's like five dollars and you can find them in Boots and things like that. It's a genius thing and I panic if ever I think I've lost it. I'm a sucker for anything that saves time in regards to grooming," Agron shared.

If you haven't heard of purple shampoo before, this product is perfect for people with blonde hair who want to maintain their tone with ease. According to Glamour, purple shampoo keeps your hair healthy and protects your color from becoming brassy and dull. This is because the purple pigments in the product counteract the warmer, yellow tones that turn your platinum blonde hair into a darker shade over time.

To properly maintain your blonde hair with purple shampoo, use the product once or twice per week, depending on how often you wash your hair (per Redken). You should still primarily use your regular shampoo when washing your hair, as the purple shampoo is only meant to be used sparingly to achieve the best results.