paint problem need help please

I can get it out, but it takes 15-20 min with a clay bar on a 2"x2" spot and a hell of a lot of effort. It would take months and one hell of a lot of clay bar to get it all. I will try the hot water and see if it leaves a finger print tomorrow after work.Even a tiny dirt flake takes the same effort, sap is a real pain in the arse.I was told no go on polishing as I would them smear the contaminates into the clear?