Sometimes your screens just need the screen material replaced. Over time the UV rays, weather and accidental damage cause the screening to compromise. If not repaired and you open your windows for fresh air, you could be allowing in insects or other unwanted visitors. Check your screens yearly for damage, it's not costly to remove the old screen and spline and replace with new. It also looks better too! Simply Clean uses top notch replacement screen and spline when we do repair screens.