Sodium chloride doesn't react with plastic materials.
See the link below.
how to remove salt from plastic
salt corrodes glass
practically nothing the salt will just sit on the plastic if you don't believe me try it yourself mmaybe im missing a detail
"Plastic" isn't a single thing. There are very light plastics that float in salt water, and very dense plastics that do not.
salt hot water, plastic jug ,knife, and string
salt will react with rubber in the presence of heat, rubber can get brittle.
oil, low density, plastic flow, and subsurface salt layers.
80 g table salt may be contained in a salt shaker but also in a little plastic bag or in a can.
Rock salt sources: Science test
Bleach Salt PVC plastic
by mixing sperms hot water and salt.
Yes, it is possible, in a humid environment.