Originally Posted by justplainbill
If you are referring to the metallic portion of the probe, a blue (non-scratching) Scotchbrite pad with some Fels Naptha or Octagon soap and hot water should do the trick.
I removed the 4 screws below the probe; separating the 2 halves is where the gunk is; this is what needs cleaning.
So far I've applied denatured alcohol. It helps but perhaps there's something better... Thanks for your help.