What about using alkaline striper and tooth brush. Worth a try. 

Best Regards,
Randy Frye, CEI Surface Pros
www.ceisurfacepros.com
239-253-1991

On Jul 5, 2016, at 9:42 PM, Pat Staples <cpstaples@msn.com> wrote:

Looking for new ideas for removing years of crystallizing from these grout lines
They are badly glazed over

Thank you
Carl Staples
Classic Marble & Stone Restoration
610-356-4100
www.marblerestore.com 
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