@Ozzie2191 I think that heating water in it for a while would dissolve the remnant. The other 2 though, wax based, would take multiple cycles of heating, cleaning with soap, running through a dishwasher, and the crayon one might still be contaminated.
Actually, water initially. Then water with a couple of drops of dish soap are the best way to clean the wax out. After you heat the water, you should see rainbow-ish swirls on top of the water. A paper towel gently laid across the top of the water should soak up the wax/oil.
Many memories ago I used Teflon saucepans to heat paraffin for canning and blended paraffin and beeswax for candles. No matter how many times i heated the pan and wiped it out, there was still wax. Water and dish soap were able to pull the wax out of the Teflon pores. Enjoy