His collaboration with Damien Hirst sold for over $1.8 million at auction.
The piece, called Keeping It Spotless, was an iconic one of Hirst's spot paintings, featuring one of Banksy's French maids stencils lifting the image to sweep dust. It was sold for $1,870,000 through Sotheby's auction house in New York City on Valentines Day in 2008. However, this is not Banksy's only piece to exceed the million marker. Just two weeks later, Sotheby's auction house in London sold Banksy's Simple Intelligence Testing for $1,265,120.