Well - the problem was more-or-less resolved.
The parking lot where I keep the car has guard dogs. They are fed bones. The rats need food, especially this time of year, when it's about -7 C and everything's under snow.
When I return from work and park the car, the rats home-in onto a warm engine. So they've made a nets and a good stash of bones. That's how they've been tracking-down the car thoughout the parking lot, even after I've moved it.
Well - got rid of the stash, got rid of the dog's bones, etc - and the problem just went away.
BTW - on the ame parking lot rats ate through a fuel-line of some older car - the owner turned it on, and the car burned all out!!! That's rats for you....
