It is used on sensitive metal surfaces such as aluminum. It provides an effective and easy cleaning. It can also be used on vertical surfaces by foaming. Prolonged contact with air creates a dull oxide layer on aluminum surfaces. Cappel P 115, non-acidic aluminum cleaner and polish, removes tough dirt and oxide layer, does not damage aluminum. The foaming effect allows the product to clean by clinging to vertical surfaces. It can be applied with hand sprayers or pressure washers.