Been removing labels from steel shelving at work. Label Off 50 from Kontact Chemie in a spray can of course, and I needed a scraper. Not steel, too much damage to the paint, so now on the second PVC ruler as scraper, as they, for some reason, keep breaking after being used that way and exposed to the label remover. As a bonus the Label Off 50 is really good at removing old marker residue and also removing double sided tape.