Barnacle Bleach is a bleach only seen in the episode "Krusty Krab Training Video." It is one of the few non-food products that Barnacle Products Incorporated produces. You have to be quick to catch because it appears in a background cut where it goes to the closet. It is possible that SpongeBob has used in the past to clean something. It is also a possibility that it has been sponsored by The Krusty Krab. It can probably be found in the Barg'N-Mart.
It looks like an average bleach, and the color of the bottle is gray. The bottle is quite big because it is a cleaning supply.