What you will need
Remove the old batteries if they are still inside.
Dip the Toothbrush into the cup of vinegar.
Scrub the battery contacts with the toothbrush scub for at least 1 minute (if you hear sizzling that is the vinegar neutralizing the battery acid.)
Wipe the terminals and compartment with a cloth or paper towel.
Put new batteries in to test the furby.
Wash your hands. You should was your hands because the battery acid can burn you.