S-Express
Guest
When I was a kid I'd wash my bike with some fairy liquid and my dad's old car sponge. Then I'd throw some 3in1 all over the chain and crank and ride off into the sun.
Nothing has fundamentally changed in bicycle design or technology which would make any difference to that approach.

but just to clarify. I do not leave my frame dirty, i just don't wash/shampoo it or go for showroom appeal. I don't leave mud on it either.