Minneapolis, US (Richard Cummins, LP)

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Readers of the US version of Travel and Leisure magazine voted Minneapolis America's cleanest city in 2010. Its hygienic credentials are largely attributable to its Downtown Improvement District - an area encompassing 120 blocks overseen by "clean ambassadors" who are on hand to deal with everything from blocked storm drains to wonky street signs.

Last year, these neat freaks removed an impressive 350 tonnes of rubbish and erased 5,753 items of graffiti. And if you're the kind of person who has a rusting washing machine in the back of your garden, Minneapolis is the place for you - it's the only city in America to accept electronic waste at no extra charge.

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