INT-14 White numbers discolored by smoke

My first smoke of pork butt and when done I could no longer see the white 1 and 2 on my probes. They “absorbed” the smoke. Tried rubbing off, washing with dish soap and a soft scrubber. Nothing works

Hello,
Perhaps you could soak it in white vinegar for several hours, then wipe it clean with coarse paper.
Alternatively, you could scrape it clean directly with a small knife.