The sensor on my infrared camera has needed cleaning for a while - so today I actually did it. We had a talk at camera club last year on caring for your camera, including how to clean the sensor. It's actually very easy. Yes, you do have to be careful, but it really isn't the great mystery it's portended to be. I then went with John and Pepper for a walk in the woods and took the camera to check it out. Almost all good - just a few spots bottom right corner which won't show unless it's a bright patch; these would be easily dealt with by the healing brush in PhotoShop.
Now to finish preparations for a CC committee meeting this evening.