Lots of bike shops sell it, because bike windsheilds are all made of plastic, and it's a common problem.

HINT: Never use any kind of glass cleaner on headlights. Even the stuff at the gas stations usually have some content of Alcohol, or Ammonia, which will actually cause the plastic to fog up. It also helps it dry "streak free!", but at the expensive of any plastic parts. Look for anything that is specifically for plastic. Or, in a pinch a light soap and water mix is fine. I use a simple eyeglass cleaner you can find in almost anygeneral store.

The plastic in headlights issofterthan the paint job on your car... don't wash it with anything you wouldn't wash your whole car with.

 

there's one product that works really well on motorcylce windshields and thats the bugsbgone by sea foam, it works awesome or so everyone says we've sold it to for that