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Dagradt has got you covered if you're writing a Combat Routine.
But, It sounds like you are asking for profile help rather than Combat Routine help. If so, most CRs (but not all) will attack neutral mobs as long as they are on the target list. Singular will, I know for certain.
You make certain these mobs are on the target list by supplying a <Factions> or <MobIDs> element in your <GrindArea> on a grinding profile. See the Grinding Starter Profile for an example.