Saw this in manchester (on monday when I went to see LCD soundsystem & hot chip- beast!!) on a busy bridge which was dirty from all the daily traffic pollution, managed to snap this pic quickly in between cars.
Such a clever idea! This cleaning company must have created a stencil, then used their pressure washers to 'blast away' the dirt.
Perfect example of brilliant advertising; free, unique, engaging and fun whilst perfectly demonstrating and linking to what they actually do and showing how well they do it.
If the design were better it would have been immense.
