Air Deflector - Mopar (68258747AC) $78.80Why would you leave that on all the time? At least take them off when you wash the car. That's like leaving your underwear on when you're having sex.
Mine were in the trunk when the car appeared magically on the car fairy trailer; I didn't realize people would by them and tossed them in the trash. Next day I saw they'd go for $100 on line. DOH.
Cheap enough to just replace the whole splitter when needed.
2015-2018 Dodge Challenger Air Deflector 68258747AC | Wholesale MOPAR