The wd 40 will leave a slick film that makes it easier to wipe off dust etc.
Cleaning carbon fiber bicycle frame.
Cleaning and washing it s fine to wash carbon bicycles and components like you would any other using warm soapy water and a hose.
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.
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.
Use car dash board panel wipe to polish your bike its a far higher silicone content than most polishes.
Or use a coating of car wax.
Touching up carbon chips can be as simple as dabbing on some clear nail polish.