They have never beat the Redskins in Washington.
Not only have the Lions never defeated the Redskins at FedEx Field, they have never defeated the Redskins in Washington. Since the Redskins moved to Washington in 1937, they are 21-0 against the Lions at home.
The Washington Redskins on January 8, 2000 in Washington. The Redskins won 27-13.
As of the 2008 season, the last time the Lions won at Lambeau was December 15, 1991 when they defeated the Packers 21-17. Between 1992-1994, the Packers' home game against the Lions was played in Milwaukee. The Lions lost all three of those games. So the Lions have lost 16 straight games on the road against the Packers and 13 straight at Lambeau.
The Redskins have never beaten an opponent by more than 45 points in the history of the franchise. The last time they beat an opponent by exactly 45 points was during their last Super Bowl championship season. On September 1, 1991, Washington defeated the Detroit Lions, 45-0, at RFK Stadium.
Prior to 2011 that was 1982 ... the Bills defeated the Chiefs and Vikings, the Redskins defeated the Eagles and Buccaneers, and the Lions defeated the Bears and Rams.
October 30, 1988 in Houston by the score of 41-17.
Before they beat the Washington Redskins 19-14 on September 27, 2009, the Detroit Lions had a 19-game losing streak and their last win was December 23, 2007, when they defeated the Kansas City Chiefs 20-25 at Ford field in Detroit.
Through the 2009 season, that was January 5, 1992 when they defeated the Dallas Cowboys, 38-6, in the Wildcard round.
As of the 2008 season, that was the 1999 season when the Lions made the playoffs as a wild card team. They lost in the Wild Card round to the Washington Redskins, 27-13.
That was January 12, 1992 when the Lions lost to the Washington Redskins by the score of 41-10. The Redskins went on to defeat the Buffalo Bills in Super Bowl XXVI.
November 17, 1991 was the last time the Washington Redskins defeated the Pittsburgh Steelers.
36 years ago.