The Dees recorded a stellar 15.17 (107) to 3.1 (19) victory in the round 12 clash at Deakin Reserve.
All thanks to a superb second half rout.
The Demons piled on 13 goals and held the undermanned combined outfit scoreless.
Despite the convincing result, the top-ranked outfit was made to work hard for its ninth win of the campaign.
Shepparton Notre-Mooroopna got the early jump and led by nine points at the first break, but that is where momentum swung in favour of United.
Cassidy Mailer was sublime with four goals, while the athletic Molly Kennedy was judged best afield for the Demons.
Keeley Skepper (two goals), Elissa Down (one) and recent AFLW draftee Aurora Smith (one) all provided strong support.
Ch'E Atkinson and Kierley Lane were the standouts for the combined outfit.
Meanwhile, Shepparton Swans pulled off a stunning upset over the previously undefeated Moama Magpies.
The Swans survived a late scare to hold on for a memorable win.
After leading by 36 points at the last break, the Swans hung on to clinch a 6.17 (53) to 6.9 (45) triumph.
Maddy Gray led the way for the Swans with a classy two-goal game.
Teammates Amarlee Zito and Alyssa Lindrea chipped in with quality performances.
Lastly, Seymour cruised to a comfortable win over Echuca United despite inaccuracy in front of goals.
The Lions got their fifth win of the campaign thanks to a 4.15 (39) to 1.2 (8) victory.
Darcie Donovan was the only multiple goal-scorer with two majors.
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