Just do the following:
1) Instruct child to close the nostril not containing the bead
2) Instruct the child to blow through the obstructed nostril (WARNING: DO NOT put your hand out to catch whatever is in there!)
3) After the shock of having something fling out his nose is over, have child retrieve bead, wash in sink and then squirt with Purell.
Good as new! (the nostril and the bead……)