I would be very surprised if it just washed off. Look very close at the finish. You will see small black dots all over the car, and when you apply pressure to scrub them off...they just smear and stay stuck to the finish. The clear liguid Ice product (not the detailer spray) from Turtle Wax will take those dots right off. My entire car was covered with them.
To tell you the truth...it made me sick when I saw it, and I decided to not go on the cruz.
I told the owner of the roush that she better move her car before the burnout contest but she didn't.
We have a hot water hose at the shop so I think it helped a lot. It took some work to get all the spots out as some did smear but we had 3 people cleaning it so it took about 20 minutes. I looked at your car when I was there and yours was twice as bad as hers. I know how you feel believe me but with a good washing and detailing I’m sure it was back to looking great again.