He’s cleaning up!

A serial burglar posing as a guest duped housekeepers at six different hotels into letting him into rooms as they were being tidied — and then swiped thousands of dollars worth of cash, jewelry and electronics once he was inside, police said.

The crime spree began on July 23, at the Club Quarters Hotel on William Street in the Financial District, where he slipped into a room as it was being cleaned and ripped off a $1,300 MacBook Pro, a $223 backpack, a wallet valued at $74, a MacBook case and Apple headphones, police said Friday.

Four days later, he hit a pair of hotels.

First, he pretended to be staying in a room at the Hilton Garden Inn on Water Street, where he took a $2,000 laptop, $1,100 in cash, a $500 watch and other miscellaneous items.

He then made his way uptown, where he looted a room at the Courtyard Marriott on West 40th Street. There, he stole two laptops, a tablet, a cellphone, earbuds, a passport, a checkbook and a credit card. Cops could not provide a total value of the stolen items.

On July 30, he stole technology and belongings worth just shy of $2,000 from a room in the DoubleTree Hotel on Stone Street, police said. The next day, he ransacked a room at the Marriott Marquis in Times Square.

And on Aug. 8, he posed as a hotel guest at the Grand Hyatt New York on East 42nd Street and stole a $2,200 MacBook Pro and $400 Bose headphones, according to cops.

Police said all of the victims were from out of state.

Cops provided photographs that show their suspect in the hallway of the Grand Hyatt during his most recent burglary.