Gail, It is impossible to answer your question to any degree of specificity without first examining the objects in question. You should dust metal objects frequently with soft, natural bristle brushes such as a "Lord Sheraton" or you can vacuam with a soft-bristle nozzle attachment. Avoid wiping dust off with cloths as dust can be very abrasive and you can actually abrade the surface of the objects by cleaning in this way. Do not use water or cleaning solutions without first consulting with a conservator. You should have the objects which you have chosen for this exhibition surveyed by an experienced metals or objects conservator. If you do not have access to a conservator you can contact The American Institute for the Conservation of Historic and Artistic Works at (202) 452-9545. They offer a free referral service and can send you a computer generated list of objects conservators in your region. They also offer a series of free information brochures. Dave David Harvey Conservator of Metals & Arms Colonial Williamsburg Foundation P.O. Box 1776 Williamsburg, VA 23187-1776 USA voice: 804-220-7039 e-mail: [log in to unmask]