Sadly, I believe these ‘Inspector General’ positions in the United States have no real authority. They can expose government waste, corruption, etc., make recommendations, etc... But they have no power and no real teeth.
In Canada we have an ‘ethics’ commissioner with essentially the same nonexistent power and authority. Our Prime Minister Justin Not Ready Trudeau was found to be in violation of ethics rules/laws, but nothing will ever be done about it. He’ll never be charged or made to account for his violations. He’s essentially off the hook for accepting gifts and vacations from a lobbyist he’s described as being a ‘friend’.
The IG and Congress can make referrals to the DOJ to prosecute.
What we still need is a DOJ configuration or a Special Prosecutor who would prosecute Deep State crimes.
Until that happens, there is no path to draining the swamp.