We use a product called
"Rep-con" on our windshields as per the SOP.
It is the same product as "Rain-x" this one just has airplanes on the bottle.
And in the years using it have never seen it to eat either the plastic windscreens of our helicopters,or the glass of our commuters.
And i know for a fact that alot of other companies use Rain-x cause itīs the same product.
Ofcourse one should stick to the SOP, but Rain-x can and never will be as toxic or as corrosive as the standard repellent on big airliners.
Besides as good as coca-cola is, the chemicals that you actually have to use to remove the repellent, is a tad more corrosive and less tasty btw.....
Good day