if you dont ask/mention it to them, odds are they will remove plastic and wash ect, RE Gold class, dont think its any stronger per say, but it is a high end car wash shampoo, as for using dawn i wouldnt rec/bother, you could always clay, polish, then top w good wax, i was going to clay my new 07 Santa Fe, but decided not to, i did inspect paint though, ended up appying Klasse Twins, and i just ordered Nattys Blue Wax which ill apply as a topper to Klasse, id like to add 1 more coat of SG though, after all, the good ol Canadian winter is around the corner grrrrrr lol, i will clay however next spring