Alcantara is actually a microfiber fabric that resembles suede. It can be cleaned with any gentle APC cleanser. Just dilute it down and lightly mist the area, do not saturate. Buff lighly with a towel, if you rub too hard the Alcantara will become pilly. You can also use a suede brush on Alcantara after a cleaning to bring the pile back up.
I hope this helps.
Brett @ OCD