If you’re ever cleaning a rusty gas tank, be sure to use muriatic acid. This powerful acid can clean the tank quickly and effectively, making it a great choice for any cleaning project. To use muriatic acid, first mix 1 cup of water and 1 cup of vinegar together in a pot. Pour this mixture into the rusty gas tank and stir until the ingredients are combined. Place the pot on the stove and heat up until the mixture is hot. Once the mixture is hot, pour it over the Rusty Gas Tank. Use your hands to spread it out evenly. Let the mixture sit for 10 minutes or until it has cooled down. After 10 minutes have passed, remove the pot from the stove and let it cool down before using again. Be sure to store your Muriatic Acid in a safe place so that you can always have it handy when needed!