A. Evaluate the general condition of the burial monument.
Do not attempt to clean the monument if it exhibits any cracks, flaking
and scaling, or eroding granular surfaces. Carefully sound (gently tap surface
with finger) stone to determine if there are any underlying hollow areas.
If hollow areas are detected, do not continue with cleaning or handling.
B. Determine the type of soiling to remove it in the most effective
manner. Types of soiling could be:
Carbonaceous or sooty soiling
Urban grime; dirt
Organic--algae, fungi, lichens, mosses
Stains--metallic, oils, etc.
Efflorescence (salts)
C. Initiate cleaning process with the least aggressive method--gentle,
clean water rinsing. If washing with water alone is not sufficient, carefully
proceed with the use of a selected material to facilitate cleaning. Select
the gentlest possible method that will achieve a desirable or acceptable
level of cleanliness.
D. Always test selected cleaning method(s) before general application.
Test entire cleaning procedure in a small inconspicuous area on the monument.
E. Pre-wet monument with water before the application of any chemical
cleaning solutions. Pre-wetting prevents excessive penetration of cleaning
solutions and soiling into the stone, and facilitates softening of soiling.
F. Clean from the bottom to the top of the monument to avoid streak
staining on the stone. Periodically rinse runoff.
G. Always rinse thoroughly with water. Residues from chemical cleaning
solutions can create a blotchy appearance, provide mediums for bacterial
action, and cause staining. Do not allow cleaning solutions to dry on
a monument.
H. Do not assume that a cleaning procedure that is effective in one
specific case is therefore applicable for all cleaning situations. |