Anti Graffitti products?

I need to specify an anti grafitti product for a concrete wall in a public area in Los Angeles. Has anybody had experience with these products (successful removal of grafitti) and could give me a recommendation?
Thank you!

Answers:
We use Goof off at work and it will remove dry paint and even indian ink. Check out the link below...

Other answers:
if you want to stop the ugly graff get some kids with talent and get them to piece it. youll find no one will tag it, and the kids get something they want too. you cant kill graff..try to encorporate it
if you want to stop the ugly graff get some kids with talent and get them to piece it. youll find no one will tag it, and the kids get something they want too. you cant kill graff..try to encorporate it
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