On inauguration day, President Donald Trump’s office is cleaned out, swept of signs that he and his staff had ever been there, ready for the Biden team to move in.

The cleaning out of White House’s West Wing offices, and the transition between presidents, is part of a tradition that dates back centuries. It’s a process that has not always been imbued with warmth.

Another impeached president, Andrew Johnson, a Democrat, snubbed Republican Ulysses S Grant in 1869 and skipped the inauguration. Ulysses Grant, who had backed Andrew Johnson’s removal from office, was hardly surprised.

Today, however, the transition stands out for its acrimony. The process usually starts straight after the election, but it started weeks late after President Trump refused to accept the result. And the president has said he will not attend the inauguration. Most likely, Donald Trump will instead travel to his Mar-a-Lago club in Florida.

Even in the best of times, the logistics of a transition are daunting, involving the transfer of knowledge and employees on a massive scale.

About 4,000 political appointees hired by the Trump administration who will lose their job and be replaced by individuals hired by Joe Biden.

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During an average transition, between 150,000-300,000 people apply for these jobs, according to the Center for Presidential Transition, a nonpartisan organization based in Washington. About 1,100 of the positions also require Senate confirmation. Filling all of these positions takes months, even years.

Four years of policy papers, briefing books and artefacts relating to the president’s work will be carted off to the National Archives where they will be kept secret for 12 years, unless the president himself decides that portions may be released early.

Furniture in the White House, such as the Resolute Desk in the Oval Office, most of the artwork, china and other objects, belong to the government and will remain on the premises.

Other items, like photos of the president that hang in the hallway, will be taken down as the White House is transformed for its new occupants.

The Trumps’ personal belongings, such as clothes, jewellery, and other items will be moved to their new residence, most likely at Mar-a-Lago in Florida.

This year, the place will be deep cleaned.

President Trump, as well as dozens of others at the White House, were infected with the coronavirus over the past several months, and the six-floor building, with its 132 rooms, will be thoroughly scrubbed down. Everything from handrails to elevator buttons to restroom fixtures will be wiped and sanitized, according to a spokeswoman for the General Services Administration, the federal agency that oversees the housekeeping effort.

Incoming first families usually do some redecoration. Within days of arriving at the White House, Donald Trump had chosen a portrait of populist president Andrew Jackson for the Oval Office. He also replaced the drapes, couches and a rug in the office with ones that were gold-colored. On inauguration day, VP Mike Pence and his wife will also make way for Kamala Harris, and her husband, Doug Emhoff. They will be settling into their official residence, a 19th Century residence on the Naval Observatory grounds, a couple of miles from the White House.