Yeah i can totally relate to that i was always guilty of just always using an Automated car wash on my cars but i had a very shiny black car & it always did the trick. Don't think that's an option any longer with the roof bars.Try to avoid curbing the 18" wheels. They are stupidly expensive to replace, even second hand. I clean and polish mine every month to keep them looking like new. Sadly I don't bother with the rest of the car, just the wheels.
I see you're nr Newquay Monkey Tree jetwash is another handy location.