How can you remove excess concrete/mortar from brick?

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My friend recommended her handyman to repair my front porch stairs. The top step was pulling away from the landing and the mortar needed to be filled in. The guy did the same repair on her stairs last summer so I hired him. Needless to say my job did not turn out so great. He left excess concrete/mortar and it dried solid. I want it removed and not a paint coverup. Suggestions?
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