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I can’t say for sure if will remove it but I’d try a dedicated sensor cleaning kit, or if you have a local shop that does repairs they might offer cleaning services too.

But Sirius-ly Dog Star... Of all the neat and interesting or just regular things to see in the night sky, Sirius, The Dog Star in constellation Canis Major, is considered the easiest to find, because it is the brightest star in the night sky. Being close to the Orion Constellation also helps make it easy to find. Sirius is going to continue getting brighter because it is moving toward us, in about 60,000 (60.000) years it will be a very close neighbor. (This is the equivalent of 28 minutes, 20 seconds worth of exposure). If you can find Sirius up high enough in the sky, then just below it you should be able to find Messier Object M41, The Mini Beehive Cluster (related in name to Messier M44 the Beehive Cluster). Sirius and M41 are companions, tracking together across the night sky. There are some other interesting objects, clusters and nebulae in that region, probably the most famous is Sh2-308, Dolphin Head Nebula. Canis Major (Big Dog): https://www.constellation-guide.com/constellation-list/canis-major-constellation/ Sh2-308: https://astrocat.info/sharpless-308-the-dolphin-nebula/ Sh2-304: http://galaxymap.org/cat/view/sharpless/304 Cr-121 (Collinder Open Cluster): https://in-the-sky.org/data/object.php?id=20726 Messier M41: https://www.go-astronomy.com/messier.php?Messier=M41 Sirius: https://www.space.com/21702-sirius-brightest-star.html Sirius: https://en.wikipedia.org/wiki/Sirius

It usually takes about a week or a few days longer. After taking the battery out, turning the power switch to ‘On’ has been mentioned as helping speed things up, I do not know one way or another about that, but I should mention it.

Fuji shooter. X-Pro 1, X-T30, X-T4, XF10, but currently on the X-T5. Based in Los Angeles. IG: @TOPSHELFJUNIOR