Try a piece of cardboard large enough to cover the flat surfaces (hood, roof) cover the cardboard with a rubber cement or spray adhesive. Then rub the adhesive, after it dries, with some rubbing alcohol or solvent. That makes the adhesive sticky for a long time without drying. Even a double sided tape would work nicly. Cats absolutly hate anything sticky. It might jump up on it once or twice but it definatly won't stay up on it.
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