I've seen a lot of folks do it, but in the long run will mixing dawn degreaser with the car soap to remove road grime, bug residue, and tree wax hurt the clear coat or paint?
Will not hurt the paint in any way unless you do it every day possibly. Worst case scenario though is you'll loose a lot of longevity with whatever wax or sealant you have on your vehicle when you wash it this way.
Good to know. I use spray wax so it doesn't last very long to begin with. I travel close to 4000 interstate miles every 4 months for college classes, so I'll use dawn at the end of every semester.