I think he's referring to the new ones from the store when the new shipment hasn't arrived and the selection is limited to the scuffed up gunk smeared, picked through dregs of piping and doesn't want to make a second trip to get them.
For those... scrape a sharp pairing knife blade across the surface of the pvc... moderately at first, then finish with light pressure. Same method for putting a slight bevel on the inside and outside of the pipe ends.
