You are never going to remove all the fascists. You cannot actually kill the fascist ideology through reason and argument because it's not based on reason and argument as you would understand it.
What you CAN do, is make fascists so afraid that they stay in their basements having sekret Klan meetings and sharing letters in Soldier of Fortune magazine.
We have failed that part. And this is what happens when you let it take root in your society. You're still having dinner with nazis.