Chatsworth House in Derbyshire is starting its anual deep clean today after the festive period.
Every year a team take down the last of their Christmas decorations and begin their cleaning process.
This is the last of the 30 trees to be taken down, which have been up since the beginning of November.
30,000 books have to be dusted in the library and the crystals on their huge chandeliers have to be cleaned.
The house has 300 rooms, hundreds of windows, miles of carpet and dozens of curtains.
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Police said the men were detained during a 'safety and security operation'.
Mark Orme was last seen on Sunday.
The 24-year-old was charged with 14 counts of wounding with intent to do grievous bodily harm and one count of throwing a corrosive fluid.