Am using Aussie mega which is supposed to avoid build up. My hair is shoulder length, medium to fine texture, and straight. I wash it every 3rd or 4th day. After I blow dry it, it looks good but even by the next day I feel it's looking a bit 'lank' at the back and it feels as if it has product in even though I've rinsed like mad.
I've tried expensive stuff like Aveda but didn't notice much difference.