buzzbomb
Resident Lurker
If you immediately start scrubbing off dried insectae exoskeleton, it won't matter how soft a cloth you use, the dead bug itself will scratch your plastic, guaranteed.
When I clean my helmet shield, I wet a paper towel and drape it over the shield, let it soak five minutes or so, then gently wipe the bug guts off in one smooth motion. I then dry the shield (dab with a kleenex) and follow up with a quick spritz of Plexus and a microfiber polishing cloth. I know some folks think paper towels are evil, but my shield looks as clear as the day I bought it two years ago.
My bike' windshield, I spray with Aerostich's bike cleaner and let soak while I unwrap the hose and wet my chamois. Most of the bug guts come off pretty easily; I don't sweat scratches in my windshield as I never look thru it! Guess I'm not a very aggressive driver.
+1
A wet towel soaked over the bug encrusted visor (or even helmet, car bonnet or whatever is covered in deceased desiccated insect carcasses) will dissolve the little buggars, and the ramains can just be wiped off.
We have that problem with our lake here. A quick ride around the lake at night ends up covering the bike in smelly insects, and I've found the wet towel/cloth or paper towel works wonders.
BB