Well, least corrupted if you look at how corruption is defined in the laws of the land. A lot of the corruption is legalized by law(state sanctioned or state run monopolies, or oligopolies run by politicians) and thus not counted towards the corruption score in international rankings.
That's a lot of conjecture in one post. But then again, conservative shills with their ritual hate of wealth redistribution would write something like that.
Would you care to give some examples from the countries in question? (SE, LU, FI, DK)