For DRY spots ... wipe the area with a clean dry towel, then use a suede brushes to remove any dirt. Finish with a suede erasers to buff, and smooth the natural nap.
For WET spots ... wipe the area with a clean dry towel, then GENTLY apply a LIGHTLY damp towel with water and a little bit of white vinegar. Let dry. Finish with a suede brush, and then buff with a suede eraser.