Moritic? never heard of that.. Maybe you mean muriatic acid.. used to disinfect swimming pools.. its another name for hydrochloric acid.. And it eats steel faster than it dissolves iron oxide (rust) and thats a bad thing.
What's used in most commercial rust removers is phosphoric acid. It dissolves rust much faster than it dissolves the steel underneath.
Another much weaker but more enviro-frendly one is citric acid.. you eat that when you drink KoolAid