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I have never been convinced that storage in a domestic garage lengthens the life of vehicles all that much. A moist or humid garage is going to encourage rust just as much as leaving the car outside - possibly even more so. Cars that are kept in a controlled environment storage are a different matter.
In my experience the most important thing is keeping the vehicle underside as clean as possible, washing off salt, drying it thoroughly and using a good quality wax treatment to protect the paintwork.
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