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Reference.org
Building maintenance unit
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<p>A building maintenance unit (BMU) is an automatic, remote-controlled, or mechanical device, usually suspended from the roof, which moves systematically over some surface of a structure while carrying human window washers or mechanical robots to maintain or clean the covered surfaces. It can also be used on interior surfaces such as large ceilings (e.g. in <a href="/facts/Stadium/AFCDDj1f">stadiums</a> or <a href="/facts/Train_station/9nTmC6vf">train stations</a>) or <a href="/facts/Atrium_(architecture)/c3Cg9TBQ">atrium</a> walls. </p>