Wanted to some input how everyone keeps their temp probes clean and in good working condition. My probes are starting to turn darker in color due to all the smoke and build up from the cooks. I always wipe them down before each use for sanitation but never seem to come all the way clean. I currently use both a TP-20 and a TP-17. I have heard everything from soap and water, to never use water, to magic erasers and alcohol pads, non-toxic cleaners, and everything in between. Would love to get some input as I want these to last as long as possible. Thanks!