4 oz. liquid solution. Did you ever notice that your favorite image on a roll of film is the one most likely to have a water spot on it? If you ever struggle with spots on your negatives, you should try this cleaner. Wipes off even the really stubborn ones easily and quickly without any damaging abrasion. Dries almost instantly, leaving no residue. Safe for all photo emulsions that we've tested it on. As with any new chemical, it's a good idea to test it on an outtake or a piece of leader to see how it performs for your application. Use in ventilated area--this is strong stuff! Packaged in a refillable 4 oz. spray bottle.