When I straighten my hair it seems greasy. I shampoo and condition then blow dry on cool or medium heat. I've used all kinds of straightening products (most are not the expensive products) and my hair always seems to be greasy with all of them. I've even tried to striaghten without anything in my hair but it still seems to not lay right. Is there any product out there that will make my hair smooth, manageable and non-greasy?