Portfolio lighting is an excellent way to bring style and illumination to any area. Hearkening back to the Victorian age, many of the models are made of high-quality materials that are built to last for decades. Cleaning many parts of portfolio lighting is easy, but accessing the cobwebs and insect carcasses that inevitably build up inside the glass can be difficult, if not impossible. Luckily, the entire problem can largely be avoided with a few occasional drops of citronella oil, a natural deterrent to flying pests. Apply a few drops of oil to the base of the lights each month.