Strange you should ask...Just received this email from my local RV store...
Sniff 'n' Stop keeps critters from crawling into RVs
One of the first pieces of advice I received as a new RV owner was to make sure I never had mice or other rodents taking up camp inside the RV storage compartments. The little devils apparently can do considerable damage chewing into boxes and wires and leaving trails of dropping in their wake.
Valterra secured an exclusive arrangement to market Sniff 'N' Stop to the RV industry just a few months before I got my motorhome, so I picked up an RV kit to test. I am happy to report that after more than a year of use, I have never been bothered by any critters or other pests find their way inside the motorhome.
The product comes in several forms -- granulated powder pouch and spray -- that use essential oils that animals instinctively avoid. It doesn't kill the pests, so that you have to clean up a dead or rotting carcass, but rather the odor repels them from trying to get into the RV in the first place. In fact, documentation claims the scent is so annoying that animals release pheromones to warn others of their same species to stay away. It is safe for kids and pets.
Following directions, I placed a pouch of Sniff 'N' Stop in each storage compartment, including those where plumbing and electrical enter the RV, as well as under the sinks. I also sprayed the bottom seal of the slideouts when they were extended.
The oils emit a pleasing odor that isn't noticeable inside the RV, unless I opened one of the cabinets under the kitchen or bathroom sink. Plus, it is barely noticeable when opening an outside storage compartment.
Developed for use in the utility industry, Sniff 'N' Stop works to repel mice, squirrels, spiders, ticks, snakes, fire ants, cockroaches, skunks and even some types of birds.