The links above are very interesting
Don’t know what manufacturer products the original poster was using...
I would first remove all the waxes and polishes off the paint washing with car wash soap or an automotive first step stripper that removes all the old wax. Then after one of these I would gently wipe down the spot in question with isopropyl alcohol. Since you’ve already tried a lot of products, we need to decide on a correcting cream and a few stages of lesser correction to polish it out. Griots has some nice stuff as do others.
https://www.griotsgarage.com/categor...s+compounds.do
https://www.sonaxusa.com/paint-polishing.html
You need good microfiber towels and probably two or three stages of correcting to polish it out.
The key is finding the right product. I been using this stuff (no longer available)but I have some and it’s excellent at removing stains of insects and tar and bird residue
https://www.ecstuning.com/b-genuine-...e/83122220425/
I also had great results with Griots paint corrrction.