I have used mineral spirits to remove duct tape before. However, last time I posted about that, Adam said he had used vegetable oil before. The veg. oil is probably a bit safer. I would dip a Q-tip in vegetable oil and wipe it on the sticky part of the tape. Continue to let the oil soak in and slowly and gently peel the tape off slowly. After that is done remember to remove all tape from the inside of an enclosure. My suggestion on attaching your thermometer would be to go get a piece of velcro, and stick it to the enclosure, and that should do the trick.