not sure if they are available yet but i would bet they are not far off

self cleaning finishes formulated to be similar to the roof material

saw a video about the new stadium in georgia and specifically the
camera shutter like retractable roof

amazing engineering there and mostly it is the material

i might be wrong but i think it is made of etfe

rain washes away everything that settles on it

very close to self cleaning with only the requirement of rain