Particles on sensor?

[SharpBananas]

On my Seek Compact Pro, I have 2 large circles that appear when the thermal scene does not have defined areas of thermal variation. It is fairly obvious and annoying.
I tried to clean the sensor carefully with a DSLR sensor cleaning kit, and have been unsuccessful. Under magnification I am able to see what I believe is one of these dots, but I can't seem to remove it.
I took some images on a thermally homogenous background so the aberrations could be clearly seen.
Any thoughts?

[DaJMasta]

since they're large and out of focus, have you tried cleaning the lens?

[Bill W]

No, those are sensor window. 
Anything on the lens surfaces will be totally out of focus.

Bill

[SharpBananas]

Yeah I ruled that out by running the Seek without the lens - The spots remained.
I ordered a better magnification device to see if I can get a better look at things. I'll share if I see anything.
Still...gotta figure out how to remove these particles.

[Bill W]

It is possible that these are spots that were there when the camera was calibrated, and have since fallen off.  So the reduced transmission is baked into the pixel gain calibration.

That would result in a hot spot when viewing hot things, and a cold spot when viewing cold things.

[Logan]

It is possible that these are spots that were there when the camera was calibrated, and have since fallen off.

Sorry I laughed on this 

[SharpBananas]

That would really suck. Although, if that were the case, wouldn't it appear when I have a defined thermal scene too? Also the halo that appears around the spots is very similar to what you would see with dust on a DSLR sensor.

[Bill W]

That would really suck. Although, if that were the case, wouldn't it appear when I have a defined thermal scene too?

Indeed it should. 
Equally a 'new' spot should show up too as reduced gain.

Bill

[Logan]

Try look at a scene with small difference across itself, but differ a lot from the camera's temperature.
You can just point it very closely to something hot or cold, so the whole picture is filled with the hot/cold part. (out-of-focus is OK, and even prefered)