What causes of curtains to fades and deteriorates the fabric?

Curtains can fade and deteriorate due to prolonged exposure to sunlight, which breaks down the fabric's fibers and dyes. Additionally, dust and dirt accumulation can lead to discoloration and degradation over time. Regular washing with harsh detergents or improper cleaning methods can also contribute to fabric wear and fading. Humidity and environmental pollutants can further accelerate the deterioration process.