There is a very stubborn spot on my sensor and nothing done so far will remove it -- it seems literally welded to the glass layer and is perhaps 25 microns across. Does someone know a super clever trick other than dynamite to get this removed? I REALLY don't want to send out the camera for a new sensor (the cost and time lost for that approach might justify a new body). I've had this problem for a while and tried everything I know of, short of sending my little M10 Mark II in for a new sensor. I've used VSGO swipes and their non-alcohol solution as well as Pec Pads with Eclipse solution. I've been careful but as aggressive as possible, to the point of being convinced there is no way a cleaning service could do any better....maybe. I live in a small town and there are no such services within two hours anyway. My wife is a long-time fine art photographer and she is stumpted, too. We are at our wits end, so asking for your help. To show the spot, I have attached reduced sized copies of images. Look fairly close to the edge at about the 4 o'clock position. As a real estate photographer, I'm aware of the problem so try to "heal the spot" when I catch it - blank walls and empty rooms are of course where it shows up. Anyway, has anyone discovered a good trick to getting this cleaned off? The best I can tell, it is NOT an imperfection or damage to the micro thin glass layer. As you can imagine, after all these cleaning attempts, the sensor is absolutely spotless except for this stubborn thing.