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Very few Banksy designs have been eradicated because they are popular in towns and cities across the world, whereas general graffiti, especially that which contain offensive words and/or lewd imagery are quickly removed.



It costs town councils money to remove. Often for the graffiti offenders to repeat their work unless anti-graffiti paint is used. But that stuff is expensive. Also, it would be unsuitable for some buildings or artistic structures. However, anti-graffiti paint contains certain chemicals that prevent spray paint from adhering and is very effective.



While I abhor graffiti because it's unsightly and often offensive, I like Banky's which some affectionados might call 'street art'. Often it conveys a political message of some sort. Whatever, it causes people to think.