Transparency International publishes this thing so we don't need to go by gut feelings re. corruption as judged by the public:
http://www.transparency.org/cpi2014/results
Spoiler: Big differences across Europe
http://www.transparency.org/cpi2014/results
Spoiler: Big differences across Europe
Also, I'm surprised that New Zealand, of all places, ranks higher than all but Denmark in cleanliness (and not surprised that North Korea and Somalia are tied in corruption).