Although Dawn is a strong soap, I feel that people still over-rate it's cleaning power. It may remove some wax but I have encountered waxes and sealants that still "stick" (Ex: #16, SG). In addition, Dawn tends to dry out plastic and rubber-trimming. I would advise that you wash with a dedicated, high-quality car wash and then follow that up with an Isopropyl Alcohol / water mixture wipedown. This IA wipedown WILL remove leftover remaining wax/sealants. Of course, if you plan on mechanically/chemically polishing (#83, #80, AIO, SSR's, IP, FP, etc.), then just wash with car wash and go straight to polishing. The polishing step will remove any wax leftover as well. Hope this helps.
MCA