You can take an example: When water droplets are sprayed on the balloons, charge is carried away from the balloons, which leaves them neutral. This is a good way to neutralize the balloons. As they become neutral, they will fall back together but will not be attracted to each other. Another way to neutralize the balloons is to touch them with a moist or damp hand. You need to remember that only where the balloons are wet is where the charges are carried away. The part of the balloon that is not wet will still attract to the other balloon where it is not wet.