On Sun, 16 Jul 2017 21:52:59 -0400, Ed Pawlowski wrote:

> That would depends on where suburbia is. In the snowbelt, the roads are
> salted and sanded and that can have an effect. Obviously that is only a
> prtion of the problem but look at windshields after 60,000 miles.

Califonria suburbia.
The environment doesn't get any easier than California, except for the
full-time sun - there's almost no dirt, grit, salt, or cold to worry about.

> I'd bet on UV. It is not kind to plastics.

I'd bet on the California UV also, as the plastic is "foggy".