Using the Deltana 12 - Inch Casement Stay Adjuster is easy. First, find the right position on your casement window where you want the adjuster to be installed. Attach the sash plate to the window sash and the sill plate to the window sill according to the markings. Once installed, you can open and close your window, and the adjuster will hold it at the position you choose. As for maintenance, just wipe it down with a dry cloth regularly to keep it clean. Avoid using abrasive cleaners as they can damage the finish. In case of any extreme weather, there's no need to worry, as the solid brass construction is built to withstand different conditions. But if you notice any loose parts, make sure to tighten them up right away to keep the adjuster working well.