Reply by Cosmicsniper

I just use a Kobalt 3” paint scraper (Lowes). Comes off clean that way. What’s left, if anything, quickly disappears with sand paper.

BTW, I think any discoloration is occuring because the wood under the sticker is NOT exposed to UV light and dirt. Once the entire board is sanded, the color difference goes away, in my experience.

-- jay, www.allaboutastro.com