You could just do what we north of the river do about all the OR plates loitering around long after previous Portlanders have perched - call them in. It works, especially when said plates are on cars seen dropping kids off at local schools.

better yet: move to Portland without your car. Stop trying to turn Portland into something else.

In the Pearl it seems like there are more CA plates than WA plates.

i live in california, and not even a cool warm part, and all winter i see oregon plates, i love portland too. but stop coming down here to escape the shitty weather