Even so, it is important to once a year lubricate with oil or grease all the fundamental components of the hardware to guarantee its correct operation, preserve the quality and the long useful life of the window.

If there are any damaged parts, they must be replaced, especially in the case of main parts of the set. The fittings should only be cleaned with a soft cloth and mild cleaning products with a neutral PH and diluted in water. Never use abrasive or aggressive cleaners, nor cleaners that contain acid, on the hardware or the window.