>Concrete doesn't wear much over time.... A high pressure hose will remove 'weathering' of concrete buildings very effectively and cheaply. Concrete eventually

>Concrete doesn't wear much over time.... A high pressure hose will remove 'weathering' of concrete buildings very effectively and cheaply. Concrete eventually starts spalling, and high pressure washing actually accelerates the spalling process. The reason these buildings aren't washed more regularly is because of that tradeoff; it's not (generally) because of maintenance budgets. Once you get spalling, maintenance becomes expensive. The Barbican can afford it, but this is one of the reasons a lot of brutalist buildings in Eastern Europe are getting sealed and painted.