The one that recently shocked me was modeling clay. My elementary school kid loves playing with clay, so I bought him some Fimo, which is proudly marketed as “non-toxic.” On a lark I looked it up anyway. It’s 11-14% phthalates by weight![1]. All the polymer clays are necessarily high in it - they’re made by compositing clay, PVC, and plasticizers. Blew my mind, and we’re giving this stuff to kids!
[1] https://pirg.org/resources/hidden-hazards/