Tino Best took a career-best six-wicket haul as the West Indies hammered Bangladesh by 10 wickets in the second Test in Khulna.
The 31-year-old from Barbados followed his maiden five-wicket haul in the first Test in Dhaka with 6-40 to help dismiss the hosts for 287 in their second innings on the fifth and final morning at Sheikh Abu Naser Stadium.
The result clinched a 2-0 series win for the tourists who needed just 4.4 overs to polish off the 27 runs needed for a 10-wicket triumph.
Chris Gayle posted a quickfire unbeaten 20 not out, while fellow opener Kieran Powell sealed the win with consecutive boundaries off Naeem Islam.
Bangladesh avoided an innings defeat thanks to a battling 94 by Nasir Hossain but lost their last four wickets on the final morning for the addition of 61 runs after resuming at 226-6.
It is Bangladesh's 65th defeat in 75 Tests since gaining Test status 12 years ago, with 34 of these by an innings.
West Indian captain Darren Sammy said: "It is a step in the right direction and the team played well, it was remarkable to see the way we played.
"Best has put us in good positions and it is good to see everyone putting in a lot of hard work."
Shakib Al Hasan had delayed a West Indian win on Saturday when he hit a defiant 97 but he fell to an irresponsible shot in the penultimate over of the day.
The two-Test series will be followed by five one-day internationals and one Twenty20 international.