Scotty PeelerLabel and Sticker Remover - Single Metal Peeler -SP2 by Scotty Peeler

Does this -- either the plastic or the metal one -- work well getting labels off of hard plastic (like a plastic trash can)?

I need a product to removed barcode labels from library books so that they can be reused. Will this remove them without damaging them?

Has anyone ever tried to sharpen the sides?

Will this remove packing tape from amazon boxes?