The Cleanest Place in Africa

"The centerpiece of the clean campaign is doubtless umuganda, a monthly day of mandatory community service. The tasks are varied, but often involve litter removal and other beautification projects. Politicians are not exempt: Rwandan President Paul Kagame and his Ugandan counterpart, Yoweri Museveni, recently labored with residents of a Kigali neighborhood to prepare construction of a school building.."

http://www.foreignpolicy.com/articles/2011/10/19/rwanda_the_cleanest_place_in_africa