I am using this Guitar Care Kit by d'Andrea since almost five years and it still is far from being empty. I have several guitars on which it is used on a regular basis (at least 4 times a year per guitar). The three items provided are a bottle of lemon oil, which is the most useful of the items as it is the main caring tool for unfinished wood surfaces (e.g. rosewood fretboards). It keeps them moist, which does not just make them look better (richer wood colour) but also improves playability (the fretboard feels so much slicker after having used the oil on it). Second, there is the string cleaner, which I don't use that often as most of my guitars are fitted with nano-strings which aren't that prone to corrosion. But on normal strings it does a pretty solid job of freeing them from dirt and rust. You just ought to be careful on spilling it on the fretboard as it is said to be rather aggressive towards wood (never had that experience). Finally, the polish can be used on finished wood parts in order to make them shiny and clean them from dirt. A polishing cloth is also provided.
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