General Cleaning / Warm Weather Notes
To gently clean superficial dirt and unwanted mold or moss off stone and marble ornaments, fill a spray bottle with one part ammonia to two parts water. Spray the solution on the affected areas and allow it to soak in for several minutes. Rinse with water (spray with hose) and repeat several times. For stubborn stains, we recommend using a non-abrasive cleanser (such as Softscrub without bleach) and a soft-bristle brush. Any cleaning beyond the most superficial should be done by a trained conservator.
In warm weather, marble ornaments are susceptible to damage caused by high humidity and acid rain. A condition called sugaring can result in a deterioration of the surface. Watch for a sandy surface on marble and take prompt action by contacting a professional conservator.