Remove loose debris. Once the spillage is dry, shake off or brush away all loose debris from your felt item.Take care not to accidentally mash any debris into the fiber of the felt.You can simply use your hand to brush debris away, especially if the issue is very minor.Use a soft bristled brush to gently brush away any stubborn debris.
Also try flicking the felt item from the back (if possible) to get off stubborn debris.
Inspect the item closely. Everything, especially food particles, needs to be removed from the item. Allowing food particles to remain in the fibers of felt can lead to deep set staining, as well as pest or sanitation issues.
If additional debris is found upon closer examination, gently use the soft bristled brush again.