Try Goof Off , it removes many odd substances and will not harm auto finishes.
Yes, car is a noun, a singular, common, concrete noun. A car is a thing.
Concrete
try pressure washing it off. . .this should lift off that kind of paint or you can use acid wash for concrete
pour more concrete over the top and smooth it out
Yes. It is a myth that a battery will run down sitting on concrete.
when a car hits a concrete barricade Newton's third law states the the barricade is hitting back on the car
when a car hits a concrete barricade Newton's third law states the the barricade is hitting back on the car
you have to sand blast it off
Car batteries do not usually corrode just sitting on concrete unless their is a leak in the container. I do know that you shouldn't place a car battery on a concrete surface as it can cause the battery to discharge its self into the concrete and you end up with a dead battery.
No
You need to try and get the concrete off before it settles. You can try scraping it off with a razor blade.