Horolene 500ml Concentrate. Dilute Horolene Brass and Copper Cleaning Concentrate in the ratio of 1 part Horolene to 7 parts of water and pour into suitable container with closed lid. Fully immerse all items to be cleaned in the solution and soak for the period of time needed to remove tarnish. Will remove grease, oil, dirt and tarnish. When the required finish is obtained remove items from solution and rinse thoroughly with hot water. Shake off excess moisture and dry completely.