Your local hardware and big box stores have good options to clean headstones...but please don't use this other one you may find there! Thanks everyone for your support! Anyone wishing to donate can do so here: / nobodyshouldbeforgotten
I want to do a side by side this summer of D2 and Wet & Forget and see which one cleans the best for the money after 6 months. I love my D2 but it sure is pricey compared to Wet & Forget.
Wet & Forget is awesome. I use that to clean old headstones in my local cemeteries after I cleaned my ancestors graves and been very impressed with the results. It's also now listed as an approved product on the national cemetery administration website.
I hate that these hardware stores classify cleaners with bleach as "headstone safe." I found out when I got some on a black T-shirt and then did laundry later only to see the bleach marks. D2 is all I use now. Costs a little more but well worth the results. I know every time it rains, those stones are pretty much cleaning themselves.