Q: Do you have any hints on how to clean mildew and dirt off a grave marker?
— Karen Tribeck, Harrisburg, Pa.
A: There are many different types of headstones, but if you know that the
marker you want to clean is granite and that it's soiled with just dirt and
mildew, here's a suggestion: First, protect any ceramic photographs or bronze
fixtures by masking them, and protect the grass around the marker by covering
it with newspapers. Then wet the stone with plain water. Next, mix a solution
of 50 percent regular household bleach and 50 percent water, and scrub the
stone, using only a nylon or fiber brush (do not use anything containing
metal because it can scratch or leave fragments behind that can damage the
granite surface). Let set for 20 to 30 minutes, then rinse with plain water.
If you do not know the type of stone, the cemetery management or the monument
company may be able to tell you — and recommend the best cleaning product.
Any abrasive or acidic cleaning agents can easily damage headstones with a
glazed finish. For bronze markers, there are special cleaning kits (available
from monument supply companies).
Over time, a significant change in the color of the marker could be a sign
that the finish has broken down and a professional refinishing is necessary.
The cemetery management may be able to suggest someone to call for an
estimate.