It is a normal and expected result. The best you could do is give the rotors a good heating and brake check from a high speed. This will help clean the friction material a quiet them a bit. I have had some limited success with using dawn detergent and a soft bristle brush and moderate hosing down.
I know the sound is unpleasant but you’ll have great brakes and will rarely have to worry about cleaning brake dust from the wheels.
If you are not a member already in FB consider joining the Carbon Ceramic Brakes group,
https://www.facebook.com/groups/2962...ibextid=W9rl1R
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2015 F06 M6 Silverstone Metallic II, Individual Full Leather, B&O, Night Vis, CCB, RKAutowerks (CP Rods/Pistons, DI Cams, CF Intakes, Coated DP's & Billet Diff Brace), InfinityAuto Turbo Inlets, Mishi Oil Cooler, JB4, XHP S3, BM S3