Or use a coating of car wax.
Cleaning carbon fiber bicycle frame.
Use car dash board panel wipe to polish your bike its a far higher silicone content than most polishes.
Yet as with any bike it s never a good idea to aim the water directly at bearings headsets cranks etc because that can wash the grease out.
It will nicely touch up clear coats over natural carbon frames.
Unless its mud mucky water etc just drops off and when you get home a quick hose down with water is usually enough to clean it.
Nail polish is cheap includes a brush built into the cap and it dries fast too.
The wd 40 will leave a slick film that makes it easier to wipe off dust etc.