We recommend using a cleaning wipe that is specifically designed for picture frames. Avoid using standard household cleaners as they could damage the finish of the frame.
Because metal attracts dust easily, metal may need to be dusted more than wood frames. Metal frames also do not have a protective coating on them, so they need to be maintained in order to prevent rust.
To avoid scratching a surface while dusting, it is best to use disposable rubber gloves. Paper towels are also great for cleaning without leaving any marks.