Diana I know how this makes you go Ahhhhh!
Use a suede brush when the boots are completly dry.
This should get all of it off. There are cleaners for it too but the first step I’d brushing the dry boot.
I would suggest to apply after the boots are clean a waterproofing spray for suede. You can find this near the shoes in any store.
They cost between 4 to 6 dollars for a can of waterproofing.
Suede brushes also come in rubber.
Suede brush most of it off. Then use a suede cleaner and allow to dry before sealing.
Camp dry spray that you get in Academy will keep the boots clean.
I would use a fine sandpaper or the fine side of an emery board and sand it lightly until clean. Make sure you use a light touch.