Of course you can always crab, bellyache and be upset about these always returning daub and scribbling on the own house walls. Or you could try to understand all this graffiti and streetart stuff and behave a bit more wisely and clever like some shop owners in the quarter did. They just let the artists paint their fronts via order and voluntarily. On the one hand the sprayer had the opportunity to work creative and to paint something nice without rushing. On the other hand those walls don´t get painted and covered by others anymore. There already is some artwork on it. The others prefer to change and colorize the remaining grey, boring and dreary house walls without paint.