The last time my bike was washed was last May. My buddy Doug washed her for me in a car wash on our way to the annual VFRD meet at the Gap.
Flat black looks the same no matter what..
I live on a dirt road so washing is pointless anyway. My car gets washed weekly and you can never tell!
. If I want to clean the chain on the bike I take the stuff with me and do it while out otherwise it's a dirt magnet.