It is concentrated, based on emulsifiers, wetting agents, penetrating agent and special solvents. It should be used as diluted with water in the ratio 1:5. If metal is very dull and tarnished, undiluted product can be used for better result. The dilution ratio will vary on dullness. Apply with brush, sponge or spray, rinse with water thoroughly to clean. Useful on all copper, brass metal pans, sinks, mugs, pots, doorknobs & other tarnished materials.