Phil Walshaw's six-goal haul helped drag Waroona off the depths of the ladder as they picked up an 11.5 (71) to 17.11 (113) win over South Mandurah at Falcon Oval on Sunday.
The Demons dominated the second and third quarters to pave their path to a victory that takes them from eighth to sixth on the ladder, and will see them avoid the wooden spoon.
South Mandurah got off to a good start with Stephen Snowdon bagging three goals in the first term, but Walshaw pegged two back to bring Waroona within eight points at quarter time.
The Demons secured the lead when Ben Wright and Theo Kearing booted goals to open the second, with Walshaw capitalising on the momentum.
The forward nailed a further four goals in the second term, bagging all of his total six in the first half as Waroona went into the long break leading by 19.
Jake Currell's efforts helped the visiting side retain their dominance in the third, as they pushed the lead out to 48 points by the final break.
South Mandurah did what they could to cut the deficit in the fourth, but couldn't stop Waroona taking the win.
The victory is the Demons' fourth on the season and pushes them above the Falcons and Halls Head on the ladder, who will play each other next week in a bid to avoid finishing in last spot.