Hi Gentleman,
 
First Onyx job for me. Custy has calcium buildup I suppose on the grout areas as shown in picture.  Should I resurface tile and replace grout? A hot powder? Your thoughts are appreciated.
 
Jason
 

Protocol
Jason Francis
Stone Restoration Pro
jfrancis@protocolfloorcare.com
333 Norton Road
Red Hook, NY 12571
tel: 845-758-6262
fax: 845-622-4886