Sixty-one seconds later, the Caps chased Bernier to the bench with a T.J. Oshie power-play goal. Oshie's goal, his 10th of the season, came from the diamond spot off a fine feed from Backstrom. The goal also came in Oshie's first game back in the lineup after an 11-game absence because of injury.
Oshie's goal was Washington's fifth on just 15 shots, and it chased Bernier to the bench in favor of Jimmy Howard, who faced a 43-shot workload a night earlier in a 3-1 win over the Kings in Detroit.
Early in the third, Detroit's Dylan Larkin spoiled Braden Holtby's bid for a second straight shutout. The Caps issued a coach's challenge, alleging goaltender interference, but the goal call was upheld, making it a 5-1 game at 1:03 of the third.
Ovechkin completed his hat trick at 9:33 of the third, slipping a shot through Howard on the short side after Backstrom won an offensive-zone draw on the left dot.
With 3:18 left, Gustav Nyquist cashed in on a Washington turnover to account for the 6-2 final.
The Caps were at the top of their collective team game on Tuesday, especially early on. That made for a tough night for the Wings in the second half of a back-to-back set.