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I thought only drunk high school boys did that.
I have fixed a many of Hot Spring with rodent damage. No spa is rat proof. I have seen many of tunnels through the foam.Now I still prefer full foam, it is the only way to go, but your post implies full foam spas do not get rodent damage.
Stay vigilante and beware of rodents!
What exactly is mouse repellent? I am not real big on putting poisons out because other critters can become unintended victims. If there is a friendly way to keep them out I would like to try it.
Just to try and reassure some of you that are worried about varmints getting in the spa, just try to make sure you seal any crevices where they might squeeze through. It doesn't take a very big opening for them. Open the equipment door from time to time and look for signs of infestation: droppings, gnaw marks, tiny little beer cans, piles of insulation or grass. Do this and most of you will be alright.Terminator