What about on dust jackets? It seems like most of the responses thus far were for paperback books.

I've got a 1st Edition copy of New Spring (Wheel of Time series) that I picked up recently on the cheap at a Borders in their clearance section. But being a clearance book, it's got this large 2" diameter spot of old sticker residue where someone peeled off a large promo sticker at some point, and it now appears to have become a permanent fixture on the jacket.

Now the Wheel of Time DJ's are of a very high gloss variety, so I think I can be a little more aggressive with this. Thoughts?