That really depends on what sort of plastic is being used… and what sort of acids.
Some acids like hydrofluoric will etch glass and metals, but won’t even touch neoprene, TFE, or FEP.
I’ve a running theory that the Cataclysmic ‘acid rain’ is some sort of extra-dimensional organic blend along the likes of formic, acetic, or tannic acids (formic acid in particular can be extremely painful without significant physical damage.)