If the areas are heavily soiled, you'll want to spray some Carpet & Upholstery Cleaner on a MF towel and wipe the surface. Don't spray directly on the suede. Follow that up with a clean MF towel to remove the dirt. Be careful not to saturate the suede. Use light sprays on the MF towel and go over the heavily soiled areas as necessary until you're satisfied. Follow up with a pass with the Cockpit Brush to groom the pile and you're good to go. If you want to maintain the suede and it's not dirty, you can get away with just using the Cockpit Brush to gently remove any surface lint, etc and groom the pile. If you search the Library, there is a video on the subject.