RE: Icing sugar on fondant! How to remove?

You can carefully go over the cracks with a bit of alcohol which will remove the icing sugar. Alcohol will then evaporate. Then rub in some shortening, very gently with your fingers. Fondant will absorb the shortening. If your fondant is smooth and elastic, it shouldn’t crack. But some fondants despite what you do, develop cracks. There is a great way to hide cracks/splits. It’s gunge. Recipe and instructions are here. https://thebakemore.blogspot.com/2017/03/gunging-sugar-spackle-that-hides-all.html