cancunia
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Yep, I think that getting rid of the scent trails is probably key, as above with disinfectant and earlier in the thread where Jeyes was mentioned. In addition to the ultrasonic, I also used some kitchen cleaner spray in the engine bay, not sure if it helped but it did no harm.Peppermint oil makes the interior smell minty fresh and possibly deters a fresh invasion provided you've removed every trace of the blighters first. They leave trails that others follow and so you might initially have one or two, but it then seems that every mouse in the locality eventually follows those trails to the inside of your van.
In my case, an initial couple turned into a weeks-long war of attrition that only ended after I physically blocked (with mesh or wire wool) every access point I could find and used a disinfectant solution to wash down everywhere between those points and where dropping were found, and also wash down the wheels and tyres. Peppermint oil did nothing to dissuade them until I'd taken those measures -- at which point it wasn't certain whether the peppermint oil was then acting as a deterrent or merely as an air freshener!
Traps did no good in my case, it simply encouraged them to investigate and there are enough additional mice around to make up for any that I trapped. In a closed space like a garage that might be different.