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Actually potentiometers can be disassembled and reassembled quite easily. They are not particularly delicate and you will be successful as long as you are reasonably mechanically inclined.
In general, replacement potentiometers are hard to find, so it's quite worthwhile to develop the skill to mix and match components from various potentiometers to build replacements when needed.
In this particular case, the first thing I would try (same as kvflyer recommends above) is cleaning with a toothbrush between the control and the chassis, without even removing the control. The failure I see most often is growth of whiskers between the chassis and the terminals of the control. If that doesn't work, remove the control and disassemble to clean.
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