Is there a way to remove hallowed ground?

I want, for aesthetic and security reasons, to keep the Hallowed biome out of my village. Problem is, before I managed to stop it, it had already spread quite a bit, so I'm searching for a way to quickly remove it.

I don't want to have to go trough each patch of grass and to remove the hallowed grass, and the purification powder don't work on it. Is there another way?

Sprinkling vile powder or throwing unholy water will remove hallow. You can make vile powder from vile mushrooms at an alchemy station or purchase it from the dryad during a blood moon. Unholy water is crafted from a bottled water, an ebonsand block, and corrupt seeds. Note that unholy water will not just remove the hallow but replace it with corruption.

In addition to Fambida's solution, you can now use the Clentaminator to purify Hallowed ground. Using green solution will turn the ground back to normal while other solutions may have some more interesting effects.