Outdoor solar lighting is both eco-friendly and convenient. Spotlights, lanterns and accent lighting harness the power of the sun to charge batteries and light up without the use of hard wiring. But to keep your solar lights shining bright, do two things. If the lights are 2 years old, the internal rechargeable battery likely needs to be replaced. Those batteries are recyclable, so be sure to drop them off at stores like Lowe’s or Home Depot to recycle. And wipe down solar panels that are covered in dirt, dust and pollen. These particles can block the sun’s rays from charging the lights. A simple wipe with a microfiber towel will do the trick.