Pizza boxes that are stained with food residue cannot be recycled in curbside recycling because the oil from the food contaminates the pulp used to make recycled paper. However, you can deposit your pizza boxes in the paper and cardboard bin at the Recycling Center located at 121 Dartmouth Avenue in Swarthmore, even if they are stained with oil from the pizza. Please remove the wax paper liners and any remaining food before placing boxes in the bins. Newman & Company hauls the contents of the paper and cardboard recycling bins to make paperboard for numerous products. Their process is not affected by a little food residue on the boxes, but they do request that the wax paper liners be removed before recycling.