CASTLE Howard is getting a deep clean ahead of it opening to the public next month.

The grounds including the woodlands, adventure playground and gardens remain open to the public daily, but before the house re-opens on March 30, the team take a few weeks to give it a thorough going over.

The housekeepers and caretakers have the challenge of 'extreme dusting' 70 feet up in the air when it comes to building's great hall, with the dome designed by Sir John Vanbrugh in the 1600s, long before modern cherry pickers and cleaning equipment had even been conceived.

Staff estimate they hoover up 2080KG of dust every year and a total of 8,640 hours are spent cleaning.