I have been storring equipment like my two combines which mice just love and can make one hec of a mess if they get into the wiring , our campers , and a few motor homes over the years with perfect success . I don't like the smell of the moth balls either , all thease things have gotten stored under a roof of a building i have that has the four sides open , for years now i'v been placing the moth ball all around on the floor underneth them instead off in them , its been working for me realy well so far , it takes most of the winter before the moth balls desovle and its easy to thro out more if you think it needs it ....... The machinery dealer was always impressed with my trade in's over the years as they show no signs of mice ever in them , What else can i say ........ it works best that way for us .....