How can we remove varnish or glue stains

How can we remove varnish or glue stains Images

How can we remove varnish or glue stains

How can we remove varnish or glue stains Description

We recently moved into a home that has a black slate hearth on the fireplace.  The previous owners spilled what appears to be varnish or maybe glue on it with spots here and (http://maplered.com) there.  HOw can we remove these and (http://maplered.com) clean the slate?
 
Thank you.

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