It seems that no matter where you place your scanners, sap and sawdust WILL accumulate on the windows. Keeping windows clear is important for scanners to project their lasers and see the wood they are scanning.
We recommend using lens wipes to clear small amounts of grime from scanner windows. For more stubborn stuck-on gunk, you may want to soak the area with Simple Green before wiping it away.
Finally, for the stickiest sap and sawdust combinations, you may have the best luck using a razor blade. Just remember to use smooth strokes to keep from scratching the glass. You want to “peel” the gunk away in one long sheet, not chip away a tiny bit at a time.