From the pledge website:
its wax-free formula

reading the FAQ there's an implication that it's oil-based:
No. Streaks can occur when switching between oil and wax polishes.

Hm. I don't think I'll try this. My can of plastic cleaner/polish is
about $7 and lasts quit a long time (since I clean the windows with
plain water and only use the polish when needed).

BTW there's no reference to plastics other than formica on the FAQ page.

Anyone want to experiment?