We don’t really use anything for that. Your windshield blocks pretty much all UV rays and if you have good tint on the other windows you’ll be fine. The biggest thing is keeping it clean and not using any greasy dressings. Those screw up the plastics more than anything.
If you really want UV protection, Bead Maker actually works very well on the interior. Doesn’t add gloss to matte surfaces. But this isn't something we really do.