Has anyone noticed if 'destroy undead' works as per SRD? I haven't.
Starting at 5th level, when an undead fails its saving throw against your Turn Undead feature, the creature is instantly destroyed if its challenge rating is at or below a certain threshold, as shown in the Destroy Undead table.
Cleric Level Destroys Undead of CR . . .
5th 1/2 or lower
8th 1 or lower
11th 2 or lower
14th 3 or lower
17th 4 or lower
To check I would need my cleric to be 5th level and to encounter skeletons or zombies which are CR 1/2.