Maybe NOT so "AWESOME" windshield information.
From first paragraph:
"Polycarbonate is sensitive to ammonia, so glass cleaners like Windex should not be used on polycarbonate".
From "Cleaning your windshield" near the end of the article:
Makes 1 quart = 1 liter windshield washing fluid
* 1/2 cup = 100ml ammonia (double this if you have a lot of bugs)
* 2 cups = 400ml isopropyl (rubbing) alcohol
* 1.5 tsp = 8ml car wash detergent (don't substitute dish soap or laundry detergent)
* 2 cups = 500ml water
Which is it.
...and...don't use plastic polish as it will ruin the protective coating????
Then they recommend plastic polish to remove scratches???????
doesn't seem all that scientific.
I'm SOOOOOO confused.
Polycarbonate is on our heads and in front of our faces...sameo sameo.
check what your helmet manufacturer says (warm water with maybe a mild soap added [read-dish washing soap])
"Bug-guts" are water soluble folks and plain hot water is all you need to clean it without shortening it's life.
I use a warm water ONLY. ( for tuff bug-guts use a wet, soft, clean, towel when washing the bike at home and let it sit on the shield for a few minutes or so. NO SOAP NEEDED!
...AND THE BUGS RINSE RIGHT OFF!
I keep a well worn cotton 'cowboy' hanky in my pocket for 'on-the-road' clean up. (since any tree will do (wink) that's what rest-stops are really for...cleaning the shields).
( road-tars? still researching but 'Lighter fluid or WD-40...sparingly! better yet; PEANUTBUTTER! )(help me Dr. Science, your our only hope)!
IMHO.....(GOTTA LOVE THE INTERNET).
Take care of those shields.