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Alcantara, you just clean it like suede. Use a gentle brush if you get something crusty on it. Never use chemicals on it. It's not a natural material but you can still stain it.
To clean the chrome exhaust, just use a regular metal polish, doing it regularly will maintain it. But Adams metal polish is great too. The Alcantara, I have had good result on the Sonax alacantara cleaner when I was cleaning the alcantara seats and jpm alcanatara products from my Old sti.