How to Remove Glue From Concrete Slab

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We are replacing hardwood floor that was glued directly to the slab.   We have removed hardwood and are dealing with glue residue on the slab.  It is wavy where the glue flowed into the texture of the wood.

What is the best way to remove the glue residue?  I am using a pneumatic chipping hammer and it is incredibly slow. 

How clean does the slab need to be before I put down the thinset?



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