The first step in cleaning suede is to brush it well with a suede brush. It cleans out any dirt and dust that collects in the suede and also works to raise the nap which brings out color too. Then you decide if your item needs to be shampooed or not.
It is always a good idea at the beginning of the season to waterproof the suede. It protects from the rain, salt stains and also food stains.