I swear by it! You can purchased the product through eBay http://www.ebay.com/itm/321909240770 in a 5-gallon container. Metal rust remover, ready-to-use, 100% guarantee to work.

Non-Hazardous, Non-Toxic, Non-Acid, Biodegradable. You don't need gloves or splash-apron to handle, Safe-To-Use!