Shampoo/conditioner for white streaks in brunette hair

[Babysharkdoodoodood]

I have brunette hair with white streaks around the hairline. Like a Mallen Streak. Natural not bleached.

But they're going a bit yellow. If I get a purple shampoo/conditioner will affect the rest of my hair?

No it won’t affect it, fanola is a good purple shampoo, you can get it on Amazon, and you can just use normal conditioner afterwards

Thanks