Comparing the two photos on this memorial. The most recent one in November of 2015 is after this beautiful original white marble marker was "Nyaloxed", and the one from 2013 shows the same marker before.
A simple treatment of water and Orvus soap, soft bristle brushes only, and a lot of rinsing afterward would have been sufficient to clean this marker.
A simple treatment of water and Orvus soap, soft bristle brushes only, and a lot of rinsing afterward would have been sufficient to clean this marker.