I was a little nervous about having mothballs in contact with paint and the plastic fuel tank, so I put a box of mothballs in an old glass jar with a metal lid. When I'm using the tractor, I screw the lid on to keep the good vapors in the mothballs. When I park it, I open the hood, then open the fuel fill door and put the opened jar thru the fill door resting on top of the tank. It has worked perfect so far (3 yrs +).
- Jay