Hi,
Sadly there is some alacantara out there that uses a water based glue. So its solvent clean only. Not seen one, so they must be pretty rare, but they exist. As with everything we do, test it first.
Best advice i can give on cleaning V dirty buffalo is to towel it down a lot, you dont get suction through it, therefore recovery is low. The towel down then re-clean then towel down usually does the trick.
Ikea sell cheap white towels, but you get strange looks if you buy >50 of them
Graeme
Access Cleaning Solutions