The Scottish striker scored a great goal after good work from Madjid Bougherra in the tenth minute when his left-foot shot beat Rhinos keeper Scott Vallow.
Former Rangers striker MacLean got his second with 14 minutes to play following good work from Deon Burton.
The Owls played well and Bougherra was on top form and named man of the match on the very eccentric local radio commentators.
Paul Sturrock's men beat the Rhinos in their third game of a
Wednesday lined up: Adamson, Coughlan, Simek, Spurr, Bougherra (McAllister), Bullen, Lunt (Folly), Whelan, Brunt (O'Brien), MacLean,