Cleaning formulations and methods of use thereof are described. Embodiments of the cleaning formulation comprise (a) an effective amount of citrus based compounds and mixtures thereof; (b) an effective amount of a surfactant selected from primary and secondary nonionic surfactants, co-surfactants and mixtures thereof; (c) an effective amount of a wetting agent; (d) an effective amount of an emulsifier; and (e) optimally, an effective amount of an environmental impurity resistance mixture with an effective amount of soy bean, palm and coconut derived surfactants. Embodiments are particularly effective, mild and non-hazardous for cleaning solar panels, glass, glass composites, polymers and the like.