The 16 fl oz (473 mL) Professional Strength Spray item is formulated for stubborn areas where salt has accumulated. Spray on. Let rest for a few minutes. Rinse. Additional applications may be required. Scrubbing not necessary in most cases, but ok if desired. Removes heavy build-up and is used for maintenance on smaller items. Salt-Away is a carefully selected blend of biodegradable ingredients specifically chosen to provide the optimum concentration of well-known cleaning materials and surface-active agents resulting in salt removal from a wide variety of surfaces. The beauty of this product is that it contains no hydrocarbon solvents thus it will not interfere or remove lubrication on items such as reels or engines allowing it to be used pretty much anywhere on or around the boat. Along with salt removal, Salt-Away has built in corrosion inhibitors that stop corrosion before it starts. Use the Salt-Away Sprays or Mixing unit to apply or alternatively mix 1-2 ounces of Salt-Away per gallon to achieve optimal concentration. This 4-ounce spray is a mild formula designed for anglers to spray salt off reels rods line and guides while fishing. Safe for all brands of reels rods and line. No need to rinse Prevents build-up on the reel. Leaves no scent in the water. Tackle box size. The 16-ounce Professional Strength spray item is formulated for stubborn areas where salt has accumulated. Spray on Let rest for a few minutes. Rinse off. No scrubbing necessary in most cases. Removes heavy build-up and is used for maintenance on smaller items. Rinsing recommended for some items. Recommended as the Starter Kit for many applications.