Can i you use caustic potash flake as a neutralize on a large amount of spilled car battery acid?
To neutralize a strong acid you need a weak alkali. You've done
enough damage, so I would stay away from anything that says caustic
on it or you're going to end up blind or gassed. Try a box of
Bicarbonate of Soda first. Or just slam it with buckets of water
and dilute it.