Our multi-functional metal anti-rust cleaner for automobile exhaust pipes contains citric acid and sodium gluconate. It restores luster, does not damage the exhaust pipe, and is simple to use. Its use method is very simple: please wear rubber gloves before use, and then evenly spray the cleaning agent on the exhaust pipe (be sure to wait for the exhaust pipe to cool to room temperature), wait for 30 seconds, wipe back and forth with a rag, and then rinse with a lot of water after cleaning, and finally dry with a dry towel. And it can stay clean for a long time.