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How long does it take to wash two million cars and change one million quarts of oil? For Dave and Lorraine Koerner, it's taken 38 years - they hit those big milestones earlier this year. Kerner's Car Wash and Quick Lube Centers, a family-owned business, has three quick-lube centers and five car washes with locations in Manchester, Exeter, Merrimack and Franklin.
Their car washes range from a tunnel car wash offering soft-cloth, hand-wiped service to self-serve bays and touch-free automatics. Collectively, the business generates about...