Dawn, or any dish soap is basically a degreaser. On the frame? Not a problem. Just be careful in other areas. I use a rinseless car wash (same as the one I use on my car), and I occasionally wax with either a car wax or furniture wax, such as Pledge. The results look great, and as mentioned above, with the wax on there, most stuff just wipes off with a rag in between any wash.