I had very good success with goo gone and honing powder with removing tar from the slate. Remember to clean with alkaline cleaner at the end. 

Adam Bartos
BiO Tile & Grout Restoration
773-575-5515 (c)
847-438-0212 (o)
www.RestoreYourTiles.com

On Sep 23, 2012, at 9:47 AM, Roger Konarski <qm144@yahoo.com> wrote:

I have been asked to remove the rubberized sheeting on some outdoor honed granite. Please see attached pictures. Would appreciate any suggestions on how  to remove what looks like tar and roofing material.
 
Thanks,
RK

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