What is the best shampoo to use for a buildup?

from daily conditioning and shampoo. One that is not too pricey.What is the best shampoo to use for a buildup?
Neutrogena clarifying shampooWhat is the best shampoo to use for a buildup?
Use Aussie Brand :Sleek%26amp; Shine Shampoo and 3 Minute Miricle Conditioner.
Back to Basics has a really good clarifying shampoo. So does Kenra. Both work really well. You get what you pay for so stay away from the stuff they sell at Walmart.....
I think Clairol has one that is specifically for buildup. But , I find that just switching my brand for one bottle is enough...
Suave Daily Clarifying
Prell is good for any build up and is also good to strip chlorine out after swimming.
I personally like Pantene Pro-V they have many different types too.
plain old vinegar! Mix a small amount in your shampoo bottle. Or you can rinse with vinegar and water. Been doing this 40+ years. No you can not smell it.