For a great, legal touch up - get the microfiber towel damp. It REALLY cleans well then.
I will use this during competition - as far as I know, they haven't made water illegal during tournaments (yet).
And if you use a damp microfiber towel with a spinner, it's almost as good as the cleaners (expensive, or cheap ones).
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I start each day with yoga and meditation. I put my right foot under my left thigh. I put my left foot under my right thigh. I arch my back as much as I can, and then I begin my mantra: Ouch, oh, that hurts.