Yes, you are cleaning the coating on the titanium, and you need to lose the abrasives. Also, you need to accept that the coating is going to discolor, and live with it. If you scrub trying to make it look "new", it will deteriorate quickly.
My experience is that ordinary powder solvent, nylon brush, and a little wax afterward are about as good as I can do. It helps that the coating is slick and cleans fairly easily.
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Science plus Art
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