S100 Total Cycle Cleaner
S100 makes great products, and this is no exception. Just spray it on your bike, let it soak and hose it off. Let the chemicals get into all the spots you can't see or reach to get rid of the dirt build-up which will help reduce moisture, in turn reducing the likely hood of rust showing up!
Give your bike a well deserved clean, and reward yourself with a well deserved ride!