You might try Bumble and Bumble Sunday Shampoo. It has a minimal scent, not herbal/floral at all. (I am VERY scent-sensitive.)

I’ve been using OGX shampoos and I have wash my hair every day and acini’s day my hair starts looking greasy on top. I tried a sample of purolgy and loved how I could go a couple days without washing. However, I really dislike the strong herbal scent. I have been ok with Aveda in the past but found purology too strong of a scent. So, I’m really looking for a shampoo that will keep my hair clean longer.