Carmakers avoid designed-in moisture pockets, vulnerable panels are galvanized both sides, bodies are fully immersed in rustproofing chemicals and many components are non-corroding plastic, all backed by a lengthy warranty. Do you really think a marijuana-buzzed high school dropout drilling holes in your new car perforating the factory sealants and spraying smelly glop will add anything? I don't think so, and it may damage the car and void the factory warranty!
Use the saved money for more frequent winter car washes.