Pledge works good.I dont spray the inner fairing with it, I spray it on a clean terry clothe and apply.Soap and water is fine but having kept a couple of bikes for a long time Ive learned to keep the hose away from electronics.Remember, the inner fairing is painted{flat black matte} and does need protection from the sun.
The silicone in pledge/armor all wil achieve this.Soap and water will not.