I think it would depend on where you live and what time of the year it is. Right now, our car is collecting lots of tiny dots of sap from the junipers. While they are some distance from the car, we had to cut down the ones that were closer to the car because of their propensity to send droplets of sticky sap - very tiny, but enough to completely cover the car with little dots. It's particularly bad on the windshield because a normal "wipe" won't get rid of the droplets. Thought we'd solved the problem by getting rid of the closest juniper, but apparently the stuff travels well. It'll be past by mid-October or so until we're out of season for that, but until then the car needs washing a few times a week - unfortunately, the garage is full. A car cover would probably work well - but those can be inconvenient if you're in and out of the car very often. Haven't decided whether or not it's worth that jump yet.
jdonalds, sorry to hear that things are not much better up there for you all. You're not getting any breaks at all from this - especially with the new fire that started just north of you. Our time is coming - and right soon, as they say.
We're all paying attention right now since our worst fire weather is right around the corner - the next two months from today will be the worst. We are kind of resigned to a bad fire season having seen the devastation up your way. Hopefully it won't come to pass, but we're ready to roll.