Hi Ainishvarandani,
Thank you for reaching out Microsoft Community.
In order for you to clean the Alcantara material, you can find the suggested care and clean for Surface devices from this link>>https://support.microsoft.com/en-us/help/4023504/surface-clean-and-care-for-your-surface.
If this helps, feel free to mark this post as an answer. Otherwise, don't hesitate to respond to this thread if there's anything else that needs to be addressed.
Kind Regards,
Crest_Z