I have not attempted to clean them as they look beautiful in their current condition. They are in great condition with the exception of a little bit of rust on the back side.
On the back (hard to see and photograph) is the verbiage. They are not dated but from research they were made in the mid-1800's. Each arm does swivel and is removable although I could only get 1 out....I did not attempt the others. They measure 15.5" wide and 6" tall. Items come from a smoke free home. The item "Pair of E. Muller Signed Bronze French Antique Piano Wall Sconce Candleholders" is in sale since Tuesday, June 30, 2020. This item is in the category "Antiques\Architectural & Garden\Chandeliers, Sconces & Lighting Fixtures". The seller is "shadow81550" and is located in Saint Simons Island, Georgia. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Costa rica, Dominican republic, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Turks and caicos islands, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Peru, Pakistan, Paraguay, Reunion, Viet nam, Uruguay, Russian federation, Montserrat, Ukraine.