Wd40 is your friend spray on rag wipe over works for me
It looks like a reaction, this will probably have caused some acid etching on the paintYour best bet to permanently remove it will be to polish it out with a proper cutting polish, with a diminishing abrasive in it (T-cut)
Just remember not to brush your teeth with it in the morning
Take pics and let us know how you get on
This too ^^^ very sage advice there
TAKE IT BACK TO THE JETWASH AND GET THEM TO SORT IT OUT, If they fooked it they shud make it good or pay to make it good.
Who is this mike character? you should at least ask them to rectify the damage first, if they chase you, well, you'll be no worse off, but If they own up they may pay for someone else to polish it up, or do it themselves.And if they mess THAT up, having already admitted fault, you can get it resprayed at their cost (after giving them three I believe chances to rectify the damage).Worth asking anyway, saves you a long and arduous t cutting job.
if you get a whiff they dont want to do it,
I got some brake cleaner on mine (don't ask) and I used SDoc Black and shine (I think they have changed the name now) from motohaus.com, came up a treat.
This gets better and better. Oh well B1k3r... Just remember....
just ask him if he is registered as a business with the inland revenue, then take photos on your phone of each person working there. Im guessing he will soon offer to sort it!!!