Shake the container of stain you will use to mix the stain. Stir the stain with a screwdriver to further ensure it is completely mixed.
Apply the initial coat of stain to the window frames. Wipe the stain onto the window frames with a clean rag. Wipe off any excess stain with a second clean rag.
Wait for the initial coat of stain to completely dry.
Wipe on further coats of stain to achieve a darker-looking finish on the window frames.
Rub the surface of the window frames with a clean rag to compress any raised grain and achieve a polish.