Oh everyone saying buythe shampoo. I only use conditioner, I ruined my hair and it went orange, I use purple conditioner and leave in for ages, I guess it less orangey

If you go for a warmer shade of blonde rather than a cooler 'ash' or white blonde then you don't need it.

Definitely buy blonde shampoo. Doesn’t need to be used every wash but at least once a week to keep foils looking fresh!
Any size bottle will last at least 3 months so it’s well worth while.
I buy mine from hairhouse warehouse (think that’s the name lol the one that’s in almost every shopping centre in vic!)

Definitely the shampoo. I see such a difference in my colour when I don’t use the purple shampoo.

It is worth it! I use purple shampoo every wash (expensive hair salon brand) and my foils have never looked better! My blonde goes really brassy without it.

Yes

My hair got brassy without it. Have used it consistently now for 15 years, and never looked brassy, even when due for another set of foils.