House cleaning won't work. You are not going to change the corporate culture overnight. Influential bureacracies like the State Department, CIA, and DOD have developed ways to deal with their political appointee masters. Ultimately, they can wait them out. But there are other ways to thwart or change policies the institution doesn't agree with.
Its the same with a our civil service "the men in grey"
Oh, the old "VE HAF VAYS!", tactic? LOL