Elderly people often don't use their cars for weeks on end, or at the very least only for a short trip to the local shops and back, not always requiring they use the windscreen wipers/washers. When working in London (commuting by train) I used to not use my car for three weeks, just enough (25 mile round trip to a nearby town to go shopping) to keep the battery topped up (more often as it got colder).
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