After just two weeks, they did it again: previously unknown ones messed up our wall again. Out of resentment, envy or for whatever reason: We don't know yet.
This time a "UF97" attached by fire extinguisher (for the 7 the colour was no longer enough) runs over our pictures.

dd12 reloaded uf97

We actually assumed that it should be good now, but well. Due to the anti-graffiti sealing of the wall, the paint should be easy to remove, which is why the city and the cleaning company would soon have to move in to remove the traces. 

So we will have the wall cleaned now.
All those involved, as well as all viewers, friends, passers-by and supporters who approached us about this, only a shake of the head remains.