What animal is good at cleaning glass?

[kaboom]

In freshwater aquarium, no animal does a better job at cleaning the glass than the bristlenose pleco. Is there someting that is comparable in saltwater? I am looking for a fish or invert that is capable of cleaning film or short hair algae mainly on glass. It must be able to achieve a turn over rate within a day or two. By that I mean, it must be able to clean the entire glass tank in one or two days. All my freshwater tanks have at least one bristlenose pleco and it keeps the glass looking clean enough that I hardly ever have to use a magnet. Is there such an animal for saltwater?