We've been in the copper cleaning business since 1987 and we are fully insured. Cu29 Shine has formulated a cleaner specialized to remove rust from copper. This cleaner is very mild. It will not harm paint, shrubs, flowers or grass. After your copper is cleaned to a lustrous shine, we apply a special sealer with a paint gun, for a lasting even coat. This sealer has built-in UV Blockers and will normally last 5 to 10 years, depending on the amount of sunlight they are exposed to.