Please see reply from Visual Comfort below...
You can advise her to try cleaning with a soft, dry cloth or duster. Our products should never be sprayed with a cleaning solution or polish. If you feel it is necessary to use a cleaning agent, please apply only a mild detergent to a soft, damp cloth for gentle cleansing. Do not use scouring agents, abrasive sponges, hydrochloric acid, vinegar, ammonia, petroleum distillate or metal silicates. Please do be careful especially with the finish that you have, since it is gold leafed.