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My mom has an old department store bike that's been sitting in the vicinity of a dryer vent for about 15 years. It's gotten lint everywhere, including into the brakes, chain, and gears. The pedals and rear wheel still turn freely, however, and it was protected from the elements so the frame is fine. About how much effort (and money) would it take to rehab it to rideable condition? She's trying to decide whether to buy a new bike or not for light riding, and if it's cheaper she would prefer to keep the one she has already ridden.