Best there is corrosionx. [url]www.corrosionx.com[/url] The product creates what the company calls a "polar bond" to protect and lubricate metal. By creating positive and negative charges, corrosionx bonds to metal not just lay on top of it. It also penetrates better than many products designed for that purpose. I have been using it for a 1 1/2 years now, best there is. Salt water no problem for it, great product.