Could statements show real intention to end corruption?

Could certain statements indicate a real intention to clean up corruption?
If so, what would be the strongest statements? You can choose up to three answers - one of which can be your own suggestion

(The question could also be put the other way around (it could be another poll): Which statements if not said are a strong indication that the speaker himself is corrupt or somehow very much forced (bribed, black-mail, fear) to not express them.)