I used to brush the stylus before each side played but now I think that is excessive, so I check it with a jewelers loupe. I also rotate between the brush and sometimes use Blue Tack instead of the brush.
Special purpose gel for cleaning the stylus are not expensive, like this Audio Technica Gel. There are a number of different brands. I would stick (😊) to something made for the purpose, lest you damage it.
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