My first thought is why not clean them in place? Wipe gently with a damp, slightly soapy cloth from inside and outside. My experience with screens is to leave them in place as much as possible. They’re easy to tweak during removal and re-installation.
On my
Scamp, they slide toward the center to free up the radius end. Then you can either push up or down (depending on which side has the springs) and swing the other side out. Sliding without removal allows you to clean most of the track. If your
Bigfoot has radius sliders, they may work similarly.