Coated, light-transmitting or reflecting substrate, used as optical component or window, e.g. lens, mirror or windscreen, has (per)fluoroalkylsilane coating produced by plasma etching, hydration, drying and gas phase deposition

A method for the gas phase deposition of partially fluorinated or perfluorinated alkyl silanes onto a substrate in a reaction chamber includes cleaning the substrate, hydrating the substrate with steam, drying the substrate and silanization of the substrate by deposition of the alkyl silane from the gas phase. The cleaning of the substrate is a plasma etching process and the hydration occurs directly after the plasma etching.