First off, let me say I spent a lot of time on the Roadfly detailing forum a few years back, so I know my stuff about detailing, you can skip the "talking to a beginner" stuff.
2009 Corolla S, bought it brand new, a month old, flawless, first in it with 9 miles on it. I waxed it with NXT 2.0 a few days after I got it, and have cleaned the bugs off the front bumper pretty much daily with quik detailer since I drove it home, recently switching to ultimate quik detailer, to add a little bit of "wax" daily when I clean the bugs off. I have been washing it with Eagle One Nanowax, which contains pure carnuba.
Needless to say, the plan was to keep this car looking flawless forever, considering all the protection I had on.
But I see this yellow stuff today. My wife simply drove to coach a soccer game, and the car was in her field of view during the game. Like I said, I'm cleaning the bumper daily, didn't notice this yesterday. I have wash it, put fresh wax on that spot, hand buffed with pressure, and when that didn't work I pulled out one of the big guns: P21S multi finish restorer, I was scared at first, since it'd new paint that that stuff is pretty abrasive if not properly used. IT DIDN'T WORK!!! The only step higher I can think of is oven-cleaner, which is usually only used on a car to remove spray paint(I used to have an e30 BMW, turns out BMW owners on the east have that problem frequently!):
here is a pic, I'm afraid it "pulled a Zaino" and seeped right through the clear coat....any ideas? Besides oven cleaner.....