Dave Ross
Participant
Post count: 2310
DickT wrote:
I use it on the car and it’s great. I tried a little on my Shoei visor and it started to craze the plastic so dont use it.
Andy King, of 18x Rusty 1000 miler fame said that a very fine spray of 100:1 dishwashing liquid / water works. Next year he will rig a windscreen washer pump and reservoir, aimed at his visor from the top of the screen......

From what I've read it does affect some visors, but not all of them. I have a spare visor that I can use to field test. Now all I need to do is to find a place that sells the stuff. You'll know that I am ready to test, when the rain suddenly stops for the next two weeks.