I used to use those black vinyl removable "bras" on my cars in the past, especially on summer road trips to keep the bugs off the finish. I would just scrub it with a brush, then pull it off the car and hang to dry when I was done. You do have to be careful to put it on over a clean car, but I never had any paint scratching issues in all the years I used them. They don't seem as popular any more. Does anyone even make one for the Model S? I have one for my '07 Pontiac Vibe, but was never able to find one for my Cadillac CTS. Maybe it's just gone out of style.