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As above, Alcantara is more like suede, and needs to be cleaned carefully, as get it wrong and you've ruined it for good. In most cases a gentle brush down does wonders to release trapped dirt and restore a fresh look. In cases where stains need to be removed, a very light spray with an APC, followed by gentle wiping and then full extraction using a wet n dry will work fine, but you need to go very easy on the wetting and level of rubbing.