NO NO NO!!! I Would NOT recommend doing that at all!!!
What the fuck! what you want to do is turn the vial end on end to mix it. Remember, winny is partical suspension. Shaking it could mess with it. (I am not 100% certain on this but why tke a chance?)
I worked at one of the largest pharm companies in the world and you never want to shake protiens and particle solutions becuase it can break the shit down. That is fact!
I know what your talking about....what I do is the night before I will mix it around for a little while (end over end) then let is stand overnight on end. In the AM, you will not have to do so much to mix it cause it won't be sticking to the sides.
hope that helps!