With a skyscraper defined as a building that is 18 metres (around 60 feet) or over, the most common form of cleaning for high rise windows is via abseil and BMU (cradle). However, some water fed pole systems are capable of reaching up to 82 feet. This makes it possible to clean skyscraper windows from ground level.

In this situation, skilled technicians, known as rope access technicians or abseilers, use ropes, harnesses, and other safety equipment to access the building's exterior from the top and descend down the facade to clean the windows.

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The short answer is, somewhere between once a month and twice a year. The in-depth answer isn't quite that vague, so let's dig a little deeper and add a few details. Here are some of the leading factors that determine how often your skyscraper windows should be washed.