My Monster:wipe round wheels etc with WD40 soaked rag after most rides & also lube chain whilst hot
  I use muckoff if bike comes in grotty, then WD too, then autoglym for polishing tank, fly screen etc. 
 Also, I remove bellypan once a month, to check if anything loose/leaking etc under the crank casings 
 Cleaning it is more for an 'all-round check' for safety, as much as having a tidy looking bike too. 
 C
 
  Edited for Steve: 6,500 miles since Xmas this year - none commuting - all pleasure:P 
 [Edited on 29-6-2005 by CK and AK]