I need to remove adhesive-backed labels from hundreds of plastic shipping cartons weekly. Best way to do fast?

Airlines affix their labels to our plastic corrugated cartons (similar to those used by the USPS). I believe that the material is polystyrene. We have great difficulty removing the labels. I'm looking for a sae, non-toxic method.I need to remove adhesive-backed labels from hundreds of plastic shipping cartons weekly. Best way to do fast?
There's a substance called Goo-Gone, and it works great for removing labels!I need to remove adhesive-backed labels from hundreds of plastic shipping cartons weekly. Best way to do fast?
We have tired the suggestions that were made and to our surprise (mine, particularly), using hot air produced the best results. Thank you very much!

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Buy a heat gun thats what I use to do. Their like $30.00 at home depot.
Why not just stick blank labels over the airline labels? Sounds like it would be easier to cover them over then remove them.
WD-40
What about heavy duty tape? It may not take all the backing of the sticker off but it would pull the front of the label off that has all the printing on it...don't you think? If you're ok with evidence of the label being there i think this would be the best way!?