[mrspandex]

Like this? http://www.amazon.com/dp/B003XNGLJU

These are very common in Michigan, where I live

[qbrass]

I've put them on plenty of cars, they only seem to catch bugs which plug the holes up. The electronic ones at least keep making noise, but there's still no telling if they actually help.

I guess it's worth a shot, but I never expect much from them.