A friend of mine worked at a Chevy dealership in the mid 70’s, a Malibu kept coming back for a rattle, they had to cut out a inner body brace to find it, it was a bottle with a note that said ha ha a—hole how long did it take ya to find this one
Soak it with water before removing it, helps a lot to keep it from flying around in air and into your lungs and on your clothes to take into the house.
Monitor heater in the shop, 200 US gallons lasted 3 years in Maine, keep it at 50 most of the time, can’t beat it for what I use it for. Homemade wood stove in the house, 4 to 5 cord a year.