Not sure about Alcantara, but for leather, been using Gyeon's stuff and they're great.
Leather Cleaner -
https://www.amazon.com/GYEON-quartz-.../dp/B07NS6BLTK
LeatherShield coating after -
https://www.amazon.com/GYEON-quartz-.../dp/B01N57S9O6
Edit: not sure I can't reply anymore...but don't forget the brush
https://www.amazon.com/Adams-Cockpit.../dp/B00632VHH4