Here is advice from the March Chemspec newsletter specifically for faux suede.
Fake suede made with solvent based adhesive, often referred to as Alcantara, can normally be wet cleaned; even put in a washing machine (at low temperature) in the case of removable fabrics. If this were tried where water based adhesives were used, the item would probably come out clean but might be completely bald.
Clearly, pre-testing in an inconspicuous area is essential, wet and rub a small area with water and another with solvent and, hopefully, only one application will remove the flocking and create a small bald spot showing very clearly the type of adhesive used. At this stage, make an assessment of the nature of the soiling to determine how deep the cleaning really needs to be.
Those materials made with water based adhesive are best ‘dry’ cleaned with solvent based Dry Fabric Cleaner and Heavy Duty Soil Lifter (undiluted) for spots, stains and heavy soiling.
Where Solvent based adhesive was used, wet cleaning is the right approach and Fast Drying Upholstery Shampoo can produce excellent results where the soiling is light. Heavier soiling will benefit from the use of Pre-Kleen Enzyme Soil Lifter as a pre-spray followed by conventional wet extraction, but only at a low temperature. Where considered really necessary, a light spray of Heavy Duty Soil Lifter, diluted with 2 parts water can be applied but must be quickly extracted. As always pre-test.
This is how I do it with fantastic results. I hope this helps!