4 July 2011 Last updated at 10:55 ET
From the BBC
Who, What, Why: How do you graffiti-proof public art?
Spray can Graffiti may be art to some, but it is seen as a nuisance by others
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A landmark sculpture project is at risk because of spiralling costs - including the budget for keeping it graffiti-free. How do you protect public artworks from vandals?
It was meant to be a towering monument - a 50m (164ft) white horse in the fields of Kent greeting Eurostar passengers to England. But now sculptor Mark Wallinger's so-called "Angel of the South" project is at risk because of rising costs.
The price tag for the Ebbsfleet Landmark Project (ELP) has gone up from £2m to £12m, according to reports, with the budget for removing graffiti over 80 years part of the revised bill.