Does it cause corrosion? 

Like water, hypochlorous acid will cause some corrosion if left exposed for extended periods of time on materials such as brass, copper, iron, or lower quality steel. To avoid water marks and corrosion to these materials, after applying solution, wipe with a clean cloth for a smooth, residue-free surface. Stainless steel can corrode as well if submersed in high concentrations for extended periods of time.