Sharing "cleaning-in-progress" and after cleaning photos of the flat gravemarkers for brothers Andrew and Michael Zagorsky buried at Calvary Cemetery, Lorain, Ohio.  
The cleaner of choice:"D/2 Biological Solution" - applied with a soft bristle brush, and using tap water from home whenever possible for lots and lots of rinsing! 
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The problem with these markers is the pesky unpolished granite areas with their darkened streaks stubbornly staying year after year.   Otherwise, "D/2" is doing a great job cleaning and lightening the polished granite surface.  
The gravemarkers have been cleaned with "D/2" once a year since 2014.  
Because I don't wish to use any solution stronger than "D/2", I'll see how these markers look this time next year.  
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Photos of the red granite marker - cleaning in progress - and after soft bristle brush cleaning and rinsing for Andrew and Josephine (Szczepankiewicz) Zagorsky. 
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Photos of the gray granite gravestone during cleaning and after cleaning and rinsing for Michael and Marie (Novascek) Zagorsky.
 
 
