I did a search on this topic and have not found the answer I'm looking for. When I laser red alder plaques, I spray with Windex or quickly rinse with water to clean them up. I have noticed the ones I have on display has like a ghosting around all the engraving. There seems to be a lighter shade just beyond the perimeters of the engraving. Has anyone else had this happen? I have a large order to do and don't have time to experiment. Thanks for any help.