The absolute best treatment for a foam pop shield is to wash it in warm soapy water. Rinse thoroughly and then dry – slowly.
There are two reasons that spraying disinfectant everywhere is not a good idea. Disinfectants can do nasty things to plastics and foams.
Wiping a microphone down with an alcohol wipe is likely to be safe, but don’t spray a microphone, and don’t spray a pop shield that’s still on a microphone. Your “kills 99.9% of germs” spray product may well kill 100% of microphones, and nobody will love you for that.