The M25 London Orbital Motorway is arguably one of the busiest highways in Europe. With more than 30 junctions, it has a large number of concrete bridges. Unfortunately, some of these suffer from unwanted graffiti that spoils the environment for local residents and other road users alike.
Depending on the type of graffiti paint or ink contamination, removing graffiti is not necessarily straightforward, with many common cleaners giving only partial cleaning or a residual ghosting effect. This is due to the penetration of those graffiti liquids into the concrete.
For easier management of graffiti, an anti-graffiti treatment can be applied that makes cleaning easier with more effective outcomes. These are grouped as permanent or sacrificial. Permanent protectors generally change the visual aspects of the surface significantly, imparting a sheen, for example, which can spoil the overall aesthetics and the sacrificial being removed with the unwanted graffiti and needing reapplication afterwards