Answer
Remove dry stains and marks from suede by gently rubbing a pencil eraser on the affected area. for wet stains lay a papertowel on top of stain to absorb most of the liquid.
http://www.ehow.com/how_3139_clean-suede.html
to clean suede shoes - instead of using a wire suede brush which takes off the top layer of the leather try using masking tape.
to clean nubuck leather use a
fine sandpaper - brings it up like new.
http://www.50connect.co.uk/index.asp?main=http%3a//www.50connect.co.uk/50c/style.asp%3farticle%3d2455
http://www.disabilityuk.com/masterpages/tipsmk5.htm
http://www.howtocleananything.com/tipdetails.asp?tid=339
http://www.realsimple.com/realsimple/content/print/0,22304,679593,00.html
hope this helps :)