You know what is a proven and effective graffiti deterrent?   Street art.  You can spend millions of dollars on anti-graffiti task forces and cleanup crews, but if you really want taggers to leave a wall alone, your best bet is to pay a local artist a few thousand bucks to paint

I have been writing my name on shit since I was in high school. Nothing particularly inspired, mostly text but sometimes I do some stencil work. By and large I tend to identify as a garden variety vandal, not an artist. My awkward fumbling in the world of graffiti grant