Erased leaked battery crusts, saved my thermometer gun during Covid 19

There was a shortage of thermometers when the pandemic started. We were required to submit our body temperatures daily. But our old thermometer gun had leaked battery crusts so it didn't work. I tried spraying Bebebalm UNDO on the crusty bits, left it for a few moments then wiped off with toilet paper. I replaced the battery.... and it works again!
-Doc Mike, Shanghai China