[gamemaniaco]

If in any piece of plastic there is some salt deposited in the plastic, will that salt dry out the plastic and damage it, making the plastic fragile?

[chenbeier]

I would say Yes, but how a salt should be deposited into the plastic.
Do you know how polymers are produced?

[gamemaniaco]

I know that UV light and heat dry out the plastic but if salt particles are deposited on the plastic I don't know if the salt dries out the plastic

[chenbeier]

Again salt would also harm the plastic, but the question is how should it get into it.

[gamemaniaco]

a piece of Tazo plastic usually has some trace of salt, if I store this piece with the salt trace will the salt dry out and make the plastic brittle?

[chenbeier]

These are DVD, they are made by Polycarbonat. Where does the salt comes from. If some is present, they will get brittle.

[Borek]

These are not DVDs.

My bet is salt is not "in" but "on". Just cleaning them with a wet rag should be OK.

[gamemaniaco]

No, the salt is not inside the plastic but superficial, if the salt remains on the surface it dries out that plastic equal to sunlight and heat, salt dry out and crack this plastic?

[chenbeier]

These are not DVDs.

My bet is salt is not "in" but "on". Just cleaning them with a wet rag should be OK.

Instead only to say these are not DVD, you should also tell what it is instead.

[Borek]

Instead only to say these are not DVD, you should also tell what it is instead.

OP already wrote what these are. Even if you have not ever heard about https://en.wikipedia.org/wiki/Tazos it is not that difficult to spot that they miss holes in the middle.

[Borek]

No, the salt is not inside the plastic but superficial, if the salt remains on the surface it dries out that plastic equal to sunlight and heat, salt dry out and crack this plastic?

Most plastics are resistant enough, but if you have some more valuable pieces just clean them out to be on the safe side.

[gamemaniaco]

I clean the tazos smas always leave a little salt deposited on the surface and this salt will cause damage to the plastic and dry out the plastic making it brittle?

[chenbeier]

Instead only to say these are not DVD, you should also tell what it is instead.

OP already wrote what these are. Even if you have not ever heard about https://en.wikipedia.org/wiki/Tazos it is not that difficult to spot that they miss holes in the middle.

My country is not on the list so I don't know them sorry. Ok some has no hole, but do they need it? A CD is not a vinyl record. But never mind.

And for the topic salt will not harm it, if it is outside on the surface.

[gamemaniaco]

plastics undergoes any reaction when salt is on the surface?

[wildfyr]

Use distilled water to clean and it won't leave a residue. Small amounts of residual salt from tap water are harmless to such plastics.