Got ambushed by someone that proceeded to spray God-knows-what sort of chemical on my car without asking permission before I realized what was happening and proceeded to scream at them to stop.

She then tried to wipe it off using a nasty white cotton towel that was pretty much black with dirt... They are very pushy and do not ask your permission to start spraying their chemical they are trying to sell on your car!

I don't know what it was but it ate through my sealant and was very sticky and tacky.

If you go to the gas station next to the DetailFest's Host Hotel, Courtyard Marriott, please watch out and be VERY clear to them that your car is off-limits. Also make sure your doors are locked and windows are up. They appear to work in teams and one distracts you while the other loots your belongings.