Thought I'd post this as I saw a few asking about this type if app in the managing storage thread. I've just tried it myself and it took my available storage from 100 mb to 257 mb. App info is currently processing and/or the app is not yet fully available for sale on the US App Store.
Thanks for posting! I was one of those asking about it. Got a free one, Cleaner, but never seemed to release more than a couple of MB. From your experience, sounds like this may be better. Just tried it. Went from 52 MB free to 83 MB so better than the other one. Hopefully will come in handy with some bigger gains when something is clogging things up.