Bangladesh completed a test and one day clean sweep over West Indies with victory in the final one day international on Friday.
Bangladesh, who have dominated throughout their tour of the Caribbean against a weakened West Indies missing all their leading players, won by three wickets after chasing down a total of 248.
The Asian side had won the two Test series 2-0 and the tour will finish with a Twenty20 international on Sunday.
"This will take us to the next level and boost our confidence, it has to be good for the side," said Bangladesh skipper Shakib Al Hasan.
Andre Fletcher struck 52 from 42 balls as West Indies recovered from losing the early wickets of Kieran Powell and Devon Smith.
Travis Dowlin (38) and skipper Floyd Reifer (40) gave Fletcher some support from the middle order and Darren Sammy (40) showed his value as an all-rounder.
But on a good batting track and with a fast outfield the total was always going to be difficult to defend and so it proved to be.
Opener Tamim Iqbal struck a lively 30 from 27 balls but it was the solid 55 from 73 deliveries from Junaid Siddique which truly set the tourists on their way.
But after Kemar Roach broke thorough with the wickets of Raqibul Hasan, Al Hasan and Siddique, Bangladesh were wobbling at 133 for five in the 28th over.
But Mohammad Mahmudullah's unbeaten half century, helped by the strong powerplay hitting of Naeem Islam steered Bangladesh home.
Mahmudullah was fortunate to survive his first ball when he was dropped by Sammy off Roach but in the end Bangladesh won with seven balls to spare as poor fielding from West Indies helped them in the latter stages.
