We have over 40 of these machines and wind up having to put stick labels on the front so we can tell which machine is which. If/when we rename or assign a new IP you have to scrap off the old label which scratches the front or leaves a sticky residue on the bezel. This way you could jus pop of the clear plate and stick a new piece of paper in there with the new info!
Try "citrus degreaser" for helping remove labels. Use a rag damp with the degreaser to apply directly to the paper, it will soak in and unstick the adheasive. Labels should peal off much easier. I've used this trick a few times, though, not on a Netapp (but have on PC cases, laptops, etc), and it seems fairly safe. Its non-toxic and smells good too. Citrus degreaser can be purchased at most bicycle stores.