Disassembly, cleaning and proper treatment, conditioning and lubrication before reassembly is the best and longest lasting repair. However, these are reserved for the most extreme cases only because one can only disassemble a control a small number of times before the metal tabbed fasteners fatigue and break off. Therefore, even with all the drawbacks of liquid solvent (i.e. deoxit and the like) cleaners, they should still be the first line of defense and treatment used since they are fairly effective, even if the effects of the procedure is not as durable as the aforementioned process. Used carefully and selectively, solvent use is non-invasive and generally fairly safe to use however thorough cleanup afterwards and protection from overspray during application is advised.