The wd 40 will leave a slick film that makes it easier to wipe off dust etc.
Cleaning carbon fiber bicycle frame.
Touching up carbon chips can be as simple as dabbing on some clear nail polish.
I use either a little wd 40 or the orange based cleaner i use on parts sprayed on a shop towel to clean most everything on my carbon bikes except the brake surface on the wheels.
Cleaning and washing it s fine to wash carbon bicycles and components like you would any other using warm soapy water and a hose.
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.
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.