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Message: <blockquote data-quote="Dave_W" data-source="post: 116051" data-attributes="member: 9521"><p>Using a strong light and magnifying glass, look at the "sensor" (it's really the OLPF, but I'm fine calling it a sensor) and see whether or not you can see these spots on the sensor. I wonder if these aren't  old oil spots that have dried and hardened to the point that a simple cleaning won't remove them? I've read where people had to resort to high grade isopropanol to dissolve the spots. That said, perhaps paying for a professional cleaning might be safer. They'll have a tough time charging you if they can't clean it as well as bear the liability if something goes wrong.</p></blockquote><p></p>