When you take the time to regularly clean and serviced your watch, it always shows in the condition of the watch. Negligence in cleaning a watch can result in dirt and dust building up and also possibly affecting its movement and various parts over the time. A luxury watch needs regular servicing like any vehicle, to ensure that all the parts are in working order. When a buyer evaluates a watch, he carefully examines the components that make up a watch, from the technical functions to the appearance. Any deteriorating parts or faulty movement will contribute to depreciation in its value.