I tried back in the day when there was no tinted screens.
It was a waist of time. I tried sprays and they just had runs and when there were no runs you couldn't see threw it.
Window film didn't work either.
All an all it was a waist of time.
I did find an articular about dieing the plastic but never found a big enough tub to do it in.
Please add your state and model of bike you have. Click user CP @ top of page and then far left click edit signature. Thanks