I personally dont think dawn is all that agressive as people make it seem. Modern paint does not have oils or need oils to be nourished with and most everybody that used Dawn as a car wash use it to strip waxes/sealants off paint any way.
I'll tell you what. Using apc and degreasers on rubber and trim pieces is way more harsh than dawn will ever be yet nobody says anything about it drying out rubber/plastic. Go wash your hands with dawn and then with a APC or degreaser and tell me which one dries your hands out more.
Plus we already use constantly use harsh cleaners on our paint and rubber. Factory wheels are example of this. They are clear coated in the same way cars are and we are all constantly using apc's/degreasers and acids on them. If our paint was or fragile we would be seeing a whole lot of damaged and oxidized wheels.