AN army of dustbusters is being formed to protect some of the region's most historic properties.

Armed with backpack vacuum cleaners, they are being sent out to tackle the muck and grime that can threaten monuments and collections.

English Heritage has to wage a constant war against the menace at its sites across the region.

And yesterday the dust-busters were in action at one of their leading North Yorkshire properties, Helmsley Castle.

Not only is such debris unsightly, but it can also shorten the life of artefacts, especially those made of iron and other metals, particularly in high humidity environments.

Dust can also cause interiors and carved stone to become dull and attract insect pests, which can damage organic materials like wood or textiles.

Conservators work hard to keep collections clean, but now they are recruiting helpers from site teams, who have volunteered for the task and given special training.

Conservator Beth Stanley said: "Dust and old properties might go together in people's minds, but it's crucial we keep on top of the problem.

"Settling dust eventually attracts moisture to objects, which often promotes rust and accelerates decay.

"Tiny particles may also scratch surfaces when they are polished if not first removed."

Staff will use the backpack cleaners under the supervision of a conservator.

The devices are highly sensitive and can operate at very low suction levels, avoiding possible damage to artefacts.

Combining that approach with traditional tools, such as fine horse hair brushes, should keep dust at arm's length, the organisation hoped.

Ms Stanley said: "There's no reason why well-trained local staff can't undertake these tasks, aided by modern technology.

"They know a great deal about the relics and appreciate their significance.

"It's also a fascinating new aspect to the job."