Expanding upon other reverse graffiti instructables
and works elsewhere
this is how you can create bright and clear street art and engage the public on issues of importance in your community with the help of some friends and a pressure washer.
This technique is very effective for etching designs into sidewalk grime but also has that "What the hell are they doing?" appeal for direct dialogue with the public. We did not attract any unwanted attention from police or security guards as we put our messages on public property. We used this technique in broad daylight, issued a press release and there were 14 of us who spoke with passersby. Check with the laws in your area.