They are one of the most invasive and insidious little critters I have ever come across...you have my sympathies.
I'm glad I left Oregon before they made their appearance.
They fly in surreptitiously, also attach themselves quickly to our clothing, ride in that way, then start looking for a home. Their ability to find any crack or crevice is impressive.
We first encountered them in Pennsylvania, and they do seem especially drawn to our shiny exteriors. I saw them swarmed on an Airstream in Virginia some years back...they were everywhere, inside and out.
Be sure to check your AC filters, as they love to crawl up into those and then you smell their dead selves when you turn the AC on.
They also like to crawl into spaces around awning framework.
An earlier post recommended using flypaper, which I think is an excellent suggestion.