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If the headlight lenses on your Lexus IS300 are milky in color and affecting the beam pattern, it's likely that the lenses have become foggy or cloudy due to the accumulation of moisture or contaminants inside the headlight housing. This can be caused by a variety of factors, including age, exposure to the elements, and the quality of the materials used in the headlight assembly. To fix this issue, you will need to replace the headlight lenses. You can try looking for replacement headlight lenses at a local auto parts store or dealership. You can also try checking online retailers or classified websites such as eBay or Craigslist to see if you can find used headlight lenses that are in good condition. If you are unable to find replacement headlight lenses, you may need to consider replacing the entire headlight assembly. This will typically be more expensive than just replacing the lenses, but it may be the only option if you are unable to find suitable replacement lenses. In any case, it's important to ensure that you get high-quality replacement parts that are designed specifically for your Lexus IS300. Using poor quality or incompatible parts can potentially cause problems and may not be safe to use on your vehicle.