If the pizza box has a little bit of residue inside, that’s okay. However, if it is very oily or greasy on the bottom then that part of the cardboard is contaminated. In this case, tear the box in half and recycle the clean top half and put the dirty bottom part in the red general waste bin.
If your pizza comes with has a small plastic pizza topper (the ones that look like a miniature table), this must go in the red general waste bin.
Pizza box, cardboard pizza box