From D/2 Biological Solution:
"We already cleaned-up the Washington Monument.
Soon we will be cleaning the Walls of Old San Juan.
Now help us clean-up our Constant Contact email list.
Please follow this link and add yourself to our email database:
The newsletter will come out 6 - 8 times a year."
Presidential Executive Order 13287 -
D/2 Biological Solution"
Executive Order 13287, Preserve America FY 2011 Triennial
Report Department of Veteran Affairs.
For full report click on the link below.
Page 3 The National Cemetery Administration recommends
"The NCA entered into an agreement with the
National Center for Preservation Technology and Training,
NPS, to evaluate marble cleaners in an effort to minimize
damage to historic headstones.
The 3-phase study began in 2004 and was completed in 2011.
The best-practice recommendations resulted in NCA's determination to use the preferred cleaner, D/2 Biological Solution"